diff --git a/clang/lib/Parse/ParseTentative.cpp b/clang/lib/Parse/ParseTentative.cpp
index dd75319b28d8..11df2f45cea3 100644
--- a/clang/lib/Parse/ParseTentative.cpp
+++ b/clang/lib/Parse/ParseTentative.cpp
@@ -624,6 +624,12 @@ Parser::TPResult Parser::isCXXDeclarationSpecifier() {
   case tok::kw__Complex:
   case tok::kw___attribute:
     return TPResult::True();
+    
+    // Microsoft
+  case tok::kw___cdecl:
+  case tok::kw___stdcall:
+  case tok::kw___fastcall:
+    return PP.getLangOptions().Microsoft ? TPResult::True() : TPResult::False();
 
     // The ambiguity resides in a simple-type-specifier/typename-specifier
     // followed by a '('. The '(' could either be the start of:
diff --git a/clang/test/Parser/MicrosoftExtensions.c b/clang/test/Parser/MicrosoftExtensions.c
index 0ff59f75aa46..6b097ab7a8de 100644
--- a/clang/test/Parser/MicrosoftExtensions.c
+++ b/clang/test/Parser/MicrosoftExtensions.c
@@ -1,4 +1,4 @@
-// RUN: clang -fsyntax-only -verify -fms-extensions %s
+// RUN: clang -fsyntax-only -verify -fms-extensions -x=objective-c++ %s
 __stdcall int func0();
 int __stdcall func();
 typedef int (__cdecl *tptr)();