diff --git a/backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/konan/objcexport/ObjCExportNamer.kt b/backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/konan/objcexport/ObjCExportNamer.kt
index d0e29f27f93..c08270bdd90 100644
--- a/backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/konan/objcexport/ObjCExportNamer.kt
+++ b/backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/konan/objcexport/ObjCExportNamer.kt
@@ -407,7 +407,8 @@ private fun ObjCExportMapper.canBeInheritedBySameClass(
         second: CallableMemberDescriptor
 ): Boolean {
     if (this.isTopLevel(first) || this.isTopLevel(second)) {
-        return (first.containingDeclaration.fqNameSafe == second.containingDeclaration.fqNameSafe)
+        return this.isTopLevel(first) && this.isTopLevel(second) &&
+                first.source.containingFile == second.source.containingFile
     }
 
     val firstClass = this.getClassIfCategory(first) ?: first.containingDeclaration as ClassDescriptor