1 files changed, 1 insertions, 1 deletions
diff --git a/lib/ARCMigrate/Transforms.cpp b/lib/ARCMigrate/Transforms.cpp
index e208e8471b..21df257872 100644
--- a/lib/ARCMigrate/Transforms.cpp
+++ b/lib/ARCMigrate/Transforms.cpp
@@ -80,7 +80,7 @@ bool trans::canApplyWeak(ASTContext &Ctx, QualType type,
     ObjCInterfaceDecl *Class = ObjT->getInterfaceDecl();
     if (!AllowOnUnknownClass && (!Class || Class->getName() == "NSObject"))
       return false; // id/NSObject is not safe for weak.
-    if (!AllowOnUnknownClass && Class->isForwardDecl())
+    if (!AllowOnUnknownClass && !Class->hasDefinition())
       return false; // forward classes are not verifiable, therefore not safe.
     if (Class->isArcWeakrefUnavailable())
       return false;