diff --git a/clang/lib/ARCMigrate/ARCMT.cpp b/clang/lib/ARCMigrate/ARCMT.cpp
index 7eb01fb..82d8acd 100644
--- a/clang/lib/ARCMigrate/ARCMT.cpp
+++ b/clang/lib/ARCMigrate/ARCMT.cpp
@@ -206,7 +206,8 @@
   WarnOpts.push_back("error=arc-unsafe-retained-assign");
   CInvok->getDiagnosticOpts().Warnings = std::move(WarnOpts);
 
-  CInvok->getLangOpts()->ObjCARCWeak = HasARCRuntime(origCI);
+  CInvok->getLangOpts()->ObjCWeakRuntime = HasARCRuntime(origCI);
+  CInvok->getLangOpts()->ObjCWeak = CInvok->getLangOpts()->ObjCWeakRuntime;
 
   return CInvok.release();
 }