diff --git a/src/main/java/com/google/devtools/build/lib/rules/objc/CompilationSupport.java b/src/main/java/com/google/devtools/build/lib/rules/objc/CompilationSupport.java
index 6be7cb5..c18335e 100644
--- a/src/main/java/com/google/devtools/build/lib/rules/objc/CompilationSupport.java
+++ b/src/main/java/com/google/devtools/build/lib/rules/objc/CompilationSupport.java
@@ -290,7 +290,8 @@
       // TODO(b/70777494): Find out how deps get used and remove if not needed.
       Iterable<? extends TransitiveInfoCollection> deps,
       ObjcCppSemantics semantics,
-      String purpose)
+      String purpose,
+      boolean generateModuleMap)
       throws RuleErrorException {
     CcCompilationHelper result =
         new CcCompilationHelper(
@@ -336,7 +337,7 @@
       result.addNonModuleMapHeader(pchHdr);
     }
 
-    if (getCustomModuleMap(ruleContext).isPresent()) {
+    if (getCustomModuleMap(ruleContext).isPresent() || !generateModuleMap) {
       result.doNotGenerateModuleMap();
     }
 
@@ -386,7 +387,8 @@
             pchHdr,
             deps,
             semantics,
-            purpose);
+            purpose,
+            /* generateModuleMap= */ true);
 
     purpose = String.format("%s_non_objc_arc", semantics.getPurpose());
     extensionBuilder.setArcEnabled(false);
@@ -404,7 +406,9 @@
             pchHdr,
             deps,
             semantics,
-            purpose);
+            purpose,
+            // Only generate the module map once (see above) and re-use it here.
+            /* generateModuleMap= */ false);
 
     FeatureConfiguration featureConfiguration =
         getFeatureConfiguration(ruleContext, ccToolchain, buildConfiguration, objcProvider);