1 files changed, 2 insertions, 1 deletions
diff --git a/lib/Sema/SemaOverload.cpp b/lib/Sema/SemaOverload.cpp
index 0fb515e80d..d7d2610742 100644
--- a/lib/Sema/SemaOverload.cpp
+++ b/lib/Sema/SemaOverload.cpp
@@ -2001,7 +2001,8 @@ Sema::PerformObjectArgumentInitialization(Expr *&From, CXXMethodDecl *Method) {
                                    From->getSourceRange()))
     return true;
 
-  ImpCastExprToType(From, DestType, CastExpr::CK_Unknown, /*isLvalue=*/true);
+  ImpCastExprToType(From, DestType, CastExpr::CK_DerivedToBase, 
+                    /*isLvalue=*/true);
   return false;
 }