diff --git a/src/main/java/com/google/devtools/build/lib/bazel/repository/LocalConfigPlatformFunction.java b/src/main/java/com/google/devtools/build/lib/bazel/repository/LocalConfigPlatformFunction.java
index 7f188bffb75706..eecf41a30ecd59 100644
--- a/src/main/java/com/google/devtools/build/lib/bazel/repository/LocalConfigPlatformFunction.java
+++ b/src/main/java/com/google/devtools/build/lib/bazel/repository/LocalConfigPlatformFunction.java
@@ -175,7 +175,11 @@ private static String buildFileContent(String repositoryName) {
             "platform(name = 'host',",
             "  # Auto-detected host platform constraints.",
             "  constraint_values = HOST_CONSTRAINTS,",
-            ")"),
+            ")",
+            "exports_files([",
+            "  # Export constraints.bzl for use in downstream bzl_library targets.",
+            "  'constraints.bzl',",
+            "])"),
         repositoryName);
   }