diff --git a/clang/lib/Sema/SemaType.cpp b/clang/lib/Sema/SemaType.cpp
--- a/clang/lib/Sema/SemaType.cpp
+++ b/clang/lib/Sema/SemaType.cpp
@@ -7963,7 +7963,7 @@
     CallingConv DefaultCC =
         Context.getDefaultCallingConvention(IsVariadic, IsStatic);
 
-    if (CurCC != DefaultCC || DefaultCC == ToCC)
+    if (CurCC != DefaultCC)
       return;
 
     if (hasExplicitCallingConv(T))