diff --git a/src/main/java/com/google/devtools/build/lib/rules/cpp/CcToolchainRule.java b/src/main/java/com/google/devtools/build/lib/rules/cpp/CcToolchainRule.java
index 41ca8d19d032f9..761b944941e8ba 100644
--- a/src/main/java/com/google/devtools/build/lib/rules/cpp/CcToolchainRule.java
+++ b/src/main/java/com/google/devtools/build/lib/rules/cpp/CcToolchainRule.java
@@ -294,7 +294,11 @@ input discovery is supported (currently Google-only).
         /* <!-- #BLAZE_RULE(cc_toolchain).ATTRIBUTE(module_map) -->
         Module map artifact to be used for modular builds.
         <!-- #END_BLAZE_RULE.ATTRIBUTE -->*/
-        .add(attr("module_map", LABEL).legacyAllowAnyFileType())
+        .add(
+            attr("module_map", LABEL)
+                .legacyAllowAnyFileType()
+                // Should be in the target configuration
+                .cfg(NoTransition.createFactory()))
         /* <!-- #BLAZE_RULE(cc_toolchain).ATTRIBUTE(supports_param_files) -->
         Set to True when cc_toolchain supports using param files for linking actions.
         <!-- #END_BLAZE_RULE.ATTRIBUTE -->*/