diff --git a/antlir/antlir2/antlir2_packager/BUCK b/antlir/antlir2/antlir2_packager/BUCK
index ce3937ab8d..f3f755ef4c 100644
--- a/antlir/antlir2/antlir2_packager/BUCK
+++ b/antlir/antlir2/antlir2_packager/BUCK
@@ -1,5 +1,6 @@
 load("//antlir/antlir2/bzl/feature:defs.bzl", "feature")
-load("//antlir/bzl:build_defs.bzl", "internal_external", "rust_binary")
+load("//antlir/bzl:build_defs.bzl", "rust_binary")
+load("//antlir/bzl:internal_external.bzl", "internal_external")
 
 oncall("antlir")
 
diff --git a/antlir/antlir2/antlir2_packager/btrfs_packager/BUCK b/antlir/antlir2/antlir2_packager/btrfs_packager/BUCK
index 411068dbbf..b66340d5a2 100644
--- a/antlir/antlir2/antlir2_packager/btrfs_packager/BUCK
+++ b/antlir/antlir2/antlir2_packager/btrfs_packager/BUCK
@@ -1,4 +1,5 @@
-load("//antlir/bzl:build_defs.bzl", "internal_external", "rust_binary")
+load("//antlir/bzl:build_defs.bzl", "rust_binary")
+load("//antlir/bzl:internal_external.bzl", "internal_external")
 
 oncall("antlir")
 
diff --git a/antlir/antlir2/antlir2_working_volume/BUCK b/antlir/antlir2/antlir2_working_volume/BUCK
index 2c94c1d9d8..29542d8972 100644
--- a/antlir/antlir2/antlir2_working_volume/BUCK
+++ b/antlir/antlir2/antlir2_working_volume/BUCK
@@ -1,6 +1,7 @@
 # @oss-disable
 load("@prelude//utils:buckconfig.bzl", "read_bool")
-load("//antlir/bzl:build_defs.bzl", "is_facebook", "rust_library")
+load("//antlir/bzl:build_defs.bzl", "rust_library")
+load("//antlir/bzl:internal_external.bzl", "is_facebook")
 
 oncall("antlir")
 
diff --git a/antlir/antlir2/appliance_vm/BUCK b/antlir/antlir2/appliance_vm/BUCK
index b2613317a1..b158255bb2 100644
--- a/antlir/antlir2/appliance_vm/BUCK
+++ b/antlir/antlir2/appliance_vm/BUCK
@@ -1,4 +1,5 @@
-load("//antlir/bzl:build_defs.bzl", "alias", "buck_genrule", "internal_external")
+load("//antlir/bzl:build_defs.bzl", "alias", "buck_genrule")
+load("//antlir/bzl:internal_external.bzl", "internal_external")
 
 oncall("antlir")
 
diff --git a/antlir/antlir2/bzl/configured_alias.bzl b/antlir/antlir2/bzl/configured_alias.bzl
index 176e7e5a0f..4d68d2de4f 100644
--- a/antlir/antlir2/bzl/configured_alias.bzl
+++ b/antlir/antlir2/bzl/configured_alias.bzl
@@ -11,7 +11,8 @@ load("//antlir/antlir2/bzl/image:cfg.bzl", "cfg_attrs")
 # @oss-disable
 load("//antlir/antlir2/cfg/systemd:defs.bzl", "systemd_cfg")
 load("//antlir/antlir2/os:cfg.bzl", "os_transition", "os_transition_refs")
-load("//antlir/bzl:build_defs.bzl", "get_visibility", "is_facebook")
+load("//antlir/bzl:build_defs.bzl", "get_visibility")
+load("//antlir/bzl:internal_external.bzl", "is_facebook")
 load("//antlir/bzl:oss_shim.bzl", fb_transition = "ret_none") # @oss-enable
 
 def _transition_impl(platform: PlatformInfo, refs: struct, attrs: struct) -> PlatformInfo:
diff --git a/antlir/antlir2/bzl/image/cfg.bzl b/antlir/antlir2/bzl/image/cfg.bzl
index 991e835ff3..3595a5b6be 100644
--- a/antlir/antlir2/bzl/image/cfg.bzl
+++ b/antlir/antlir2/bzl/image/cfg.bzl
@@ -17,7 +17,7 @@ load("//antlir/bzl:oss_shim.bzl", fb_cfg_attrs = "empty_dict", fb_refs = "empty_
 load("//antlir/antlir2/cfg/systemd:defs.bzl", "systemd_cfg")
 load("//antlir/antlir2/os:cfg.bzl", "os_transition", "os_transition_refs")
 load("//antlir/antlir2/os:oses.bzl", "OSES")
-load("//antlir/bzl:build_defs.bzl", "is_facebook")
+load("//antlir/bzl:internal_external.bzl", "is_facebook")
 
 def cfg_attrs():
     return {
diff --git a/antlir/antlir2/bzl/image/layer.bzl b/antlir/antlir2/bzl/image/layer.bzl
index 947ebac66b..e376aa1a47 100644
--- a/antlir/antlir2/bzl/image/layer.bzl
+++ b/antlir/antlir2/bzl/image/layer.bzl
@@ -26,8 +26,8 @@ load(
 load("//antlir/antlir2/os:package.bzl", "get_default_os_for_package", "should_all_images_in_package_use_default_os")
 # @oss-disable
 load("//antlir/antlir2/package_managers/dnf/rules:repo.bzl", "RepoInfo", "RepoSetInfo")
-load("//antlir/bzl:build_defs.bzl", "is_facebook")
 load("//antlir/bzl:constants.bzl", "REPO_CFG")
+load("//antlir/bzl:internal_external.bzl", "is_facebook")
 load("//antlir/bzl:types.bzl", "types")
 load("//antlir/bzl/build_defs.bzl", "config", "get_visibility")
 load(":cfg.bzl", "attrs_selected_by_cfg", "cfg_attrs", "layer_cfg")
diff --git a/antlir/antlir2/bzl/image/prebuilt.bzl b/antlir/antlir2/bzl/image/prebuilt.bzl
index 06ff45dce4..ebc2a14395 100644
--- a/antlir/antlir2/bzl/image/prebuilt.bzl
+++ b/antlir/antlir2/bzl/image/prebuilt.bzl
@@ -11,7 +11,7 @@ load("//antlir/antlir2/antlir2_rootless:package.bzl", "get_antlir2_rootless")
 load("//antlir/antlir2/bzl:build_phase.bzl", "BuildPhase")
 load("//antlir/antlir2/bzl:platform.bzl", "rule_with_default_target_platform")
 load("//antlir/antlir2/bzl:types.bzl", "BuildApplianceInfo", "FlavorInfo", "LayerContents", "LayerInfo")
-load("//antlir/bzl:build_defs.bzl", "internal_external")
+load("//antlir/bzl:internal_external.bzl", "internal_external")
 load(":facts.bzl", "facts")
 
 PrebuiltImageInfo = provider(fields = [
diff --git a/antlir/antlir2/bzl/package/cfg.bzl b/antlir/antlir2/bzl/package/cfg.bzl
index ad6b6766fa..0e5dac55ee 100644
--- a/antlir/antlir2/bzl/package/cfg.bzl
+++ b/antlir/antlir2/bzl/package/cfg.bzl
@@ -11,7 +11,7 @@ load("//antlir/bzl:oss_shim.bzl", fb_cfg_attrs = "empty_dict", fb_refs = "empty_
 # @oss-disable
 load("//antlir/antlir2/cfg/systemd:defs.bzl", "systemd_cfg")
 load("//antlir/antlir2/os:cfg.bzl", "os_transition", "os_transition_refs")
-load("//antlir/bzl:build_defs.bzl", "is_facebook")
+load("//antlir/bzl:internal_external.bzl", "is_facebook")
 
 def cfg_attrs():
     return _cfg_attrs() | rootless_cfg.attrs
diff --git a/antlir/antlir2/bzl/package/defs.bzl b/antlir/antlir2/bzl/package/defs.bzl
index 148805acb7..36f66e7719 100644
--- a/antlir/antlir2/bzl/package/defs.bzl
+++ b/antlir/antlir2/bzl/package/defs.bzl
@@ -7,7 +7,7 @@ load("//antlir/antlir2/bzl:platform.bzl", "arch_select", "os_select")
 load("//antlir/antlir2/bzl:types.bzl", "BuildApplianceInfo", "LayerInfo")
 load("//antlir/antlir2/bzl/image:cfg.bzl", "attrs_selected_by_cfg")
 load("//antlir/buck2/bzl:ensure_single_output.bzl", "ensure_single_output")
-load("//antlir/bzl:build_defs.bzl", "internal_external")
+load("//antlir/bzl:internal_external.bzl", "internal_external")
 load(":btrfs.bzl", "btrfs")
 load(":cfg.bzl", "layer_attrs", "package_cfg")
 load(":gpt.bzl", "GptPartitionSource", "gpt")
diff --git a/antlir/antlir2/features/dot_meta/tests/BUCK b/antlir/antlir2/features/dot_meta/tests/BUCK
index 7dc539dc59..bbaf0a0e60 100755
--- a/antlir/antlir2/features/dot_meta/tests/BUCK
+++ b/antlir/antlir2/features/dot_meta/tests/BUCK
@@ -2,7 +2,8 @@ load("//antlir/antlir2/bzl/image:defs.bzl", "image")
 load("//antlir/antlir2/bzl/package:defs.bzl", "package")
 load("//antlir/antlir2/features/dot_meta:dot_meta.bzl", "dot_meta")
 load("//antlir/antlir2/testing:image_diff_test.bzl", "image_diff_test")
-load("//antlir/bzl:build_defs.bzl", "buck_sh_test", "internal_external")
+load("//antlir/bzl:build_defs.bzl", "buck_sh_test")
+load("//antlir/bzl:internal_external.bzl", "internal_external")
 
 # Normally, the `dot_meta` feature is included only when packaging up a final
 # layer, but we want to make it easier to test with image_diff_test, so these
diff --git a/antlir/antlir2/features/extract/extract.bzl b/antlir/antlir2/features/extract/extract.bzl
index ff77826e21..b988bdf143 100644
--- a/antlir/antlir2/features/extract/extract.bzl
+++ b/antlir/antlir2/features/extract/extract.bzl
@@ -29,7 +29,7 @@ load("//antlir/antlir2/features:defs.bzl", "FeaturePluginInfo")
 load("//antlir/antlir2/features:dependency_layer_info.bzl", "layer_dep_analyze")
 load("//antlir/antlir2/features:feature_info.bzl", "FeatureAnalysis", "ParseTimeFeature")
 load("//antlir/buck2/bzl:ensure_single_output.bzl", "ensure_single_output")
-load("//antlir/bzl:build_defs.bzl", "internal_external")
+load("//antlir/bzl:internal_external.bzl", "internal_external")
 
 def extract_from_layer(
         layer: str | Select,
diff --git a/antlir/antlir2/features/extract/tests/BUCK b/antlir/antlir2/features/extract/tests/BUCK
index 0e9a9ab297..9ae60d5e0a 100644
--- a/antlir/antlir2/features/extract/tests/BUCK
+++ b/antlir/antlir2/features/extract/tests/BUCK
@@ -1,7 +1,8 @@
 load("//antlir/antlir2/bzl/feature:defs.bzl", "feature")
 load("//antlir/antlir2/bzl/image:defs.bzl", "image")
 load("//antlir/antlir2/testing:image_test.bzl", "image_sh_test")
-load("//antlir/bzl:build_defs.bzl", "internal_external", "rust_binary")
+load("//antlir/bzl:build_defs.bzl", "rust_binary")
+load("//antlir/bzl:internal_external.bzl", "internal_external")
 
 oncall("antlir")
 
diff --git a/antlir/antlir2/features/genrule/tests/BUCK b/antlir/antlir2/features/genrule/tests/BUCK
index d75235c3a3..da836aaf47 100644
--- a/antlir/antlir2/features/genrule/tests/BUCK
+++ b/antlir/antlir2/features/genrule/tests/BUCK
@@ -1,7 +1,8 @@
 load("//antlir/antlir2/bzl/feature:defs.bzl", "feature")
 load("//antlir/antlir2/bzl/image:defs.bzl", "image")
 load("//antlir/antlir2/testing:image_diff_test.bzl", "image_diff_test")
-load("//antlir/bzl:build_defs.bzl", "is_facebook", "rust_binary")
+load("//antlir/bzl:build_defs.bzl", "rust_binary")
+load("//antlir/bzl:internal_external.bzl", "is_facebook")
 
 oncall("antlir")
 
diff --git a/antlir/antlir2/features/install/install.bzl b/antlir/antlir2/features/install/install.bzl
index d64d40b32f..56c51a2316 100644
--- a/antlir/antlir2/features/install/install.bzl
+++ b/antlir/antlir2/features/install/install.bzl
@@ -15,7 +15,7 @@ load(
     "ParseTimeFeature",
 )
 load("//antlir/buck2/bzl:ensure_single_output.bzl", "ensure_single_output")
-load("//antlir/bzl:build_defs.bzl", "internal_external")
+load("//antlir/bzl:internal_external.bzl", "internal_external")
 load("//antlir/bzl:stat.bzl", "stat")
 
 default_permissions = record(
diff --git a/antlir/antlir2/features/rpm/tests/BUCK b/antlir/antlir2/features/rpm/tests/BUCK
index 67851db733..a521f11c89 100644
--- a/antlir/antlir2/features/rpm/tests/BUCK
+++ b/antlir/antlir2/features/rpm/tests/BUCK
@@ -1,7 +1,8 @@
 load("//antlir/antlir2/bzl/feature:defs.bzl", "feature")
 load("//antlir/antlir2/package_managers/dnf/rules:repo.bzl", "repo_set")
 load("//antlir/antlir2/testing:image_test.bzl", "image_python_test", "image_sh_test")
-load("//antlir/bzl:build_defs.bzl", "alias", "buck_genrule", "internal_external", "python_binary")
+load("//antlir/bzl:build_defs.bzl", "alias", "buck_genrule", "python_binary")
+load("//antlir/bzl:internal_external.bzl", "internal_external")
 load(":defs.bzl", "expected_t", "test_rpms")
 
 oncall("antlir")
diff --git a/antlir/antlir2/flavor/BUCK b/antlir/antlir2/flavor/BUCK
index 853e18c597..130eacd6ff 100644
--- a/antlir/antlir2/flavor/BUCK
+++ b/antlir/antlir2/flavor/BUCK
@@ -1,6 +1,6 @@
 load("//antlir/antlir2/bzl/flavor:defs.bzl", "flavor")
 load("//antlir/antlir2/package_managers/dnf/rules:repo.bzl", "repo_set")
-load("//antlir/bzl:build_defs.bzl", "internal_external")
+load("//antlir/bzl:internal_external.bzl", "internal_external")
 
 oncall("antlir")
 
diff --git a/antlir/antlir2/libcap/BUCK b/antlir/antlir2/libcap/BUCK
index 0de6e28363..bd9847fa79 100644
--- a/antlir/antlir2/libcap/BUCK
+++ b/antlir/antlir2/libcap/BUCK
@@ -1,5 +1,6 @@
 # @oss-disable
-load("//antlir/bzl:build_defs.bzl", "alias", "internal_external", "rust_bindgen_library", "rust_library")
+load("//antlir/bzl:build_defs.bzl", "alias", "rust_bindgen_library", "rust_library")
+load("//antlir/bzl:internal_external.bzl", "internal_external")
 
 oncall("antlir")
 
diff --git a/antlir/antlir2/os/cfg.bzl b/antlir/antlir2/os/cfg.bzl
index bf33539d8d..67889ee2ce 100644
--- a/antlir/antlir2/os/cfg.bzl
+++ b/antlir/antlir2/os/cfg.bzl
@@ -3,7 +3,7 @@
 # This source code is licensed under the MIT license found in the
 # LICENSE file in the root directory of this source tree.
 
-load("//antlir/bzl:build_defs.bzl", "internal_external", "is_facebook")
+load("//antlir/bzl:internal_external.bzl", "internal_external", "is_facebook")
 load(":defs.bzl", "OsVersionInfo")
 load(":oses.bzl", "OSES")
 
diff --git a/antlir/antlir2/os/oses.bzl b/antlir/antlir2/os/oses.bzl
index 2d800de77a..8f432d9e9b 100644
--- a/antlir/antlir2/os/oses.bzl
+++ b/antlir/antlir2/os/oses.bzl
@@ -3,7 +3,7 @@
 # This source code is licensed under the MIT license found in the
 # LICENSE file in the root directory of this source tree.
 
-load("//antlir/bzl:build_defs.bzl", "internal_external", "is_facebook")
+load("//antlir/bzl:internal_external.bzl", "internal_external", "is_facebook")
 
 arch_t = enum("x86_64", "aarch64")
 
diff --git a/antlir/antlir2/package_managers/dnf/build_appliance/BUCK b/antlir/antlir2/package_managers/dnf/build_appliance/BUCK
index 18a80c19d4..5afb21e09f 100644
--- a/antlir/antlir2/package_managers/dnf/build_appliance/BUCK
+++ b/antlir/antlir2/package_managers/dnf/build_appliance/BUCK
@@ -1,7 +1,7 @@
 load("//antlir/antlir2/bzl:json_file.bzl", "json_file")
 load("//antlir/antlir2/bzl/feature:defs.bzl", "feature")
 load("//antlir/antlir2/package_managers/dnf/rules:repo.bzl", "repo_set")
-load("//antlir/bzl:build_defs.bzl", "internal_external")
+load("//antlir/bzl:internal_external.bzl", "internal_external")
 
 oncall("antlir")
 
diff --git a/antlir/antlir2/package_managers/dnf/rules/makecache/BUCK b/antlir/antlir2/package_managers/dnf/rules/makecache/BUCK
index c72c5c123f..aee11a8c00 100644
--- a/antlir/antlir2/package_managers/dnf/rules/makecache/BUCK
+++ b/antlir/antlir2/package_managers/dnf/rules/makecache/BUCK
@@ -3,7 +3,8 @@
 # This source code is licensed under the MIT license found in the
 # LICENSE file in the root directory of this source tree.
 
-load("//antlir/bzl:build_defs.bzl", "buck_sh_binary", "export_file", "internal_external")
+load("//antlir/bzl:build_defs.bzl", "buck_sh_binary", "export_file")
+load("//antlir/bzl:internal_external.bzl", "internal_external")
 
 oncall("antlir")
 
diff --git a/antlir/antlir2/package_managers/dnf/rules/makerepo/BUCK b/antlir/antlir2/package_managers/dnf/rules/makerepo/BUCK
index ea81d935d4..7568283e3b 100644
--- a/antlir/antlir2/package_managers/dnf/rules/makerepo/BUCK
+++ b/antlir/antlir2/package_managers/dnf/rules/makerepo/BUCK
@@ -1,4 +1,5 @@
-load("//antlir/bzl:build_defs.bzl", "buck_sh_binary", "is_facebook", "rust_binary")
+load("//antlir/bzl:build_defs.bzl", "buck_sh_binary", "rust_binary")
+load("//antlir/bzl:internal_external.bzl", "is_facebook")
 
 oncall("antlir")
 
diff --git a/antlir/antlir2/package_managers/dnf/rules/repo.bzl b/antlir/antlir2/package_managers/dnf/rules/repo.bzl
index c4d8478136..02433bbf89 100644
--- a/antlir/antlir2/package_managers/dnf/rules/repo.bzl
+++ b/antlir/antlir2/package_managers/dnf/rules/repo.bzl
@@ -4,7 +4,7 @@
 # LICENSE file in the root directory of this source tree.
 
 load("//antlir/antlir2/bzl:platform.bzl", "rule_with_default_target_platform")
-load("//antlir/bzl:build_defs.bzl", "is_facebook")
+load("//antlir/bzl:internal_external.bzl", "is_facebook")
 load(":rpm.bzl", "RpmInfo", "nevra_to_string", "package_href")
 
 RepoInfo = provider(fields = [
diff --git a/antlir/antlir2/test_images/cfg/os/BUCK b/antlir/antlir2/test_images/cfg/os/BUCK
index 1354039cd5..087a6ddc08 100644
--- a/antlir/antlir2/test_images/cfg/os/BUCK
+++ b/antlir/antlir2/test_images/cfg/os/BUCK
@@ -5,7 +5,7 @@ load("//antlir/antlir2/bzl/package:defs.bzl", "package")
 load("//antlir/antlir2/package_managers/dnf/rules:repo.bzl", "repo")
 load("//antlir/antlir2/package_managers/dnf/rules:rpm.bzl", "rpm")
 load("//antlir/antlir2/testing:image_test.bzl", "image_rust_test")
-load("//antlir/bzl:build_defs.bzl", "internal_external")
+load("//antlir/bzl:internal_external.bzl", "internal_external")
 load(":defs.bzl", "write_os")
 
 oncall("antlir")
diff --git a/antlir/antlir2/test_images/remote_execution/BUCK b/antlir/antlir2/test_images/remote_execution/BUCK
index 6f71962d6e..dae529a639 100644
--- a/antlir/antlir2/test_images/remote_execution/BUCK
+++ b/antlir/antlir2/test_images/remote_execution/BUCK
@@ -2,7 +2,7 @@ load("//antlir/antlir2/bzl/feature:defs.bzl", "feature")
 load("//antlir/antlir2/bzl/image:defs.bzl", "image")
 load("//antlir/antlir2/genrule_in_image:genrule_in_image.bzl", "genrule_in_image")
 load("//antlir/antlir2/testing:image_rpms_test.bzl", "image_test_rpm_names")
-load("//antlir/bzl:build_defs.bzl", "internal_external")
+load("//antlir/bzl:internal_external.bzl", "internal_external")
 
 oncall("antlir")
 
diff --git a/antlir/antlir2/testing/image_test.bzl b/antlir/antlir2/testing/image_test.bzl
index dc39c71e2c..6a8a503b5d 100644
--- a/antlir/antlir2/testing/image_test.bzl
+++ b/antlir/antlir2/testing/image_test.bzl
@@ -15,9 +15,11 @@ load("//antlir/antlir2/bzl:types.bzl", "LayerInfo")
 load("//antlir/antlir2/bzl/feature:defs.bzl", "feature")
 load("//antlir/antlir2/bzl/image:cfg.bzl", "cfg_attrs", "layer_cfg")
 load("//antlir/antlir2/bzl/image:defs.bzl", "image")
-load("//antlir/bzl:build_defs.bzl", "add_test_framework_label", "buck_sh_test", "cpp_unittest", "internal_external", "is_facebook", "python_unittest", "rust_unittest")
+load("//antlir/bzl:build_defs.bzl", "add_test_framework_label", "buck_sh_test", "cpp_unittest", "python_unittest", "rust_unittest")
 load("//antlir/bzl:oss_shim.bzl", "special_tags") # @oss-enable
 
+load("//antlir/bzl:internal_external.bzl", "internal_external", "is_facebook")
+
 HIDE_TEST_LABELS = [special_tags.disabled, special_tags.test_is_invisible_to_testpilot]
 
 def _default_list(maybe_value: list[str] | None, default: list[str]) -> list[str]:
diff --git a/antlir/antlir2/testing/tests/test.bzl b/antlir/antlir2/testing/tests/test.bzl
index d6c91f12a3..90e41dad3b 100644
--- a/antlir/antlir2/testing/tests/test.bzl
+++ b/antlir/antlir2/testing/tests/test.bzl
@@ -3,7 +3,7 @@
 # This source code is licensed under the MIT license found in the
 # LICENSE file in the root directory of this source tree.
 
-load("//antlir/bzl:build_defs.bzl", "internal_external")
+load("//antlir/bzl:internal_external.bzl", "internal_external")
 
 def _product(*iterables):
     # product('ABCD', 'xy') → Ax Ay Bx By Cx Cy Dx Dy
diff --git a/antlir/bzl/build_defs.bzl b/antlir/bzl/build_defs.bzl
index 3b6ece3e4a..ac3717ef48 100644
--- a/antlir/bzl/build_defs.bzl
+++ b/antlir/bzl/build_defs.bzl
@@ -10,6 +10,7 @@ load("@prelude//utils:selects.bzl", "selects")
 # FB-internal contributors will be less likely to accidentally break
 # open-source by starting to use un-shimmed features.
 load(":build_defs_impl.bzl", "shim")
+load(":internal_external.bzl", "is_facebook")
 
 def _third_party_libraries(names, platform = None):
     return [
@@ -56,7 +57,7 @@ def _rust_common(rule, **kwargs):
     if rule != shim.rust_unittest and rule != shim.rust_python_extension and rule != shim.rust_bindgen_library:
         kwargs["unittests"] = False
 
-    if shim.is_facebook:
+    if is_facebook:
         deps = selects.apply(kwargs.pop("deps", []), lambda deps: [_ensure_dep_is_public(dep) for dep in deps])
         kwargs["deps"] = selects.apply(deps, lambda deps: deps + list(kwargs.pop("fb_deps", [])))
         if kwargs.get("unittests", False):
@@ -132,12 +133,6 @@ echo = rule(
     attrs = {"content": attrs.string()},
 )
 
-def internal_external(*, fb, oss):
-    if is_facebook:
-        return fb
-    else:
-        return oss
-
 cpp_binary = shim.cpp_binary
 cpp_library = shim.cpp_library
 cpp_unittest = shim.cpp_unittest
@@ -155,7 +150,6 @@ export_file = shim.export_file
 get_visibility = shim.get_visibility
 http_file = shim.http_file
 http_archive = shim.http_archive
-is_facebook = shim.is_facebook
 do_not_use_repo_cfg = shim.do_not_use_repo_cfg
 target_utils = shim.target_utils
 alias = shim.alias
diff --git a/antlir/bzl/build_defs_impl.bzl b/antlir/bzl/build_defs_impl.bzl
index 944d808386..dff731965a 100644
--- a/antlir/bzl/build_defs_impl.bzl
+++ b/antlir/bzl/build_defs_impl.bzl
@@ -276,7 +276,6 @@ shim = struct(
     cpp_binary = _cpp_binary,
     cpp_library = _cpp_library,
     cpp_unittest = _cpp_unittest,
-    is_facebook = False,
     cxx_genrule = _cxx_genrule,
     export_file = _export_file,
     http_file = _http_file,
diff --git a/antlir/bzl/internal_external.bzl b/antlir/bzl/internal_external.bzl
new file mode 100644
index 0000000000..bc72b1e43b
--- /dev/null
+++ b/antlir/bzl/internal_external.bzl
@@ -0,0 +1,13 @@
+# Copyright (c) Meta Platforms, Inc. and affiliates.
+#
+# This source code is licensed under the MIT license found in the
+# LICENSE file in the root directory of this source tree.
+
+# @oss-disable
+is_facebook = False # @oss-enable
+
+def internal_external(*, fb, oss):
+    if is_facebook:
+        return fb
+    else:
+        return oss
diff --git a/antlir/bzl/third_party.bzl b/antlir/bzl/third_party.bzl
index 906bf95a96..f1c5e0338c 100644
--- a/antlir/bzl/third_party.bzl
+++ b/antlir/bzl/third_party.bzl
@@ -7,7 +7,8 @@ load("@prelude//:paths.bzl", "paths")
 load("//antlir/antlir2/bzl:selects.bzl", "selects")
 load("//antlir/antlir2/bzl/feature:defs.bzl", "feature")
 load("//antlir/antlir2/bzl/image:defs.bzl", "image")
-load(":build_defs.bzl", "buck_genrule", "internal_external", third_party_shim = "third_party")
+load("//antlir/bzl:internal_external.bzl", "internal_external")
+load(":build_defs.bzl", "buck_genrule", third_party_shim = "third_party")
 load(":third_party.shape.bzl", "dep_t", "script_t")
 
 PREFIX = "/third-party-build"
diff --git a/antlir/uidmaps/BUCK b/antlir/uidmaps/BUCK
index d7a1bf39fd..c3af64f8ee 100644
--- a/antlir/uidmaps/BUCK
+++ b/antlir/uidmaps/BUCK
@@ -1,5 +1,6 @@
 load("@prelude//:paths.bzl", "paths")
-load("//antlir/bzl:build_defs.bzl", "alias", "export_file", "internal_external")
+load("//antlir/bzl:build_defs.bzl", "alias", "export_file")
+load("//antlir/bzl:internal_external.bzl", "internal_external")
 # @oss-disable
 
 oncall("antlir")
diff --git a/antlir/vm/runtime/BUCK b/antlir/vm/runtime/BUCK
index f3e988489d..955267c799 100644
--- a/antlir/vm/runtime/BUCK
+++ b/antlir/vm/runtime/BUCK
@@ -2,7 +2,8 @@ load("@prelude//:paths.bzl", "paths")
 load("//antlir/antlir2/bzl:hoist.bzl", "hoist")
 load("//antlir/antlir2/bzl/feature:defs.bzl", "feature")
 load("//antlir/antlir2/bzl/image:defs.bzl", "image")
-load("//antlir/bzl:build_defs.bzl", "alias", "buck_genrule", "internal_external")
+load("//antlir/bzl:build_defs.bzl", "alias", "buck_genrule")
+load("//antlir/bzl:internal_external.bzl", "internal_external")
 
 oncall("antlir")