diff --git a/clang/lib/Sema/SemaCast.cpp b/clang/lib/Sema/SemaCast.cpp
--- a/clang/lib/Sema/SemaCast.cpp
+++ b/clang/lib/Sema/SemaCast.cpp
@@ -2209,10 +2209,8 @@
       bool MicrosoftException =
           Self.getLangOpts().MicrosoftExt && !DestType->isBooleanType();
       if (MicrosoftException) {
-        unsigned Diag = SrcType->isVoidPointerType()
-                            ? diag::warn_void_pointer_to_int_cast
-                            : diag::warn_pointer_to_int_cast;
-        Self.Diag(OpRange.getBegin(), Diag) << SrcType << DestType << OpRange;
+        Self.Diag(OpRange.getBegin(), diag::ext_ms_pointer_to_int_cast)
+            << SrcType << DestType << OpRange;
       } else {
         msg = diag::err_bad_reinterpret_cast_small_int;
         return TC_Failed;