diff --git a/backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/konan/ObjCInterop.kt b/backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/konan/ObjCInterop.kt
index 06e233e5631..6c985b8fb6c 100644
--- a/backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/konan/ObjCInterop.kt
+++ b/backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/konan/ObjCInterop.kt
@@ -72,7 +72,7 @@ fun ClassDescriptor.isObjCMetaClass(): Boolean = this.getAllSuperClassifiers().a
 }
 
 fun IrClass.isObjCProtocolClass(): Boolean =
-        this.fqNameSafe == objCProtocolFqName
+        this.fqNameForIrSerialization == objCProtocolFqName
 
 fun ClassDescriptor.isObjCProtocolClass(): Boolean =
         this.fqNameSafe == objCProtocolFqName