diff --git a/clang/test/Preprocessor/cxx_oper_keyword.cpp b/clang/test/Preprocessor/cxx_oper_keyword.cpp
index f2eaec40110b..66586e7b36ce 100644
--- a/clang/test/Preprocessor/cxx_oper_keyword.cpp
+++ b/clang/test/Preprocessor/cxx_oper_keyword.cpp
@@ -1,6 +1,7 @@
-// RUN: not clang %s -E
+// RUN: not clang %s -E &&
+// RUN: clang %s -E -fno-operator-names
 
-// Not valid in C++.
+// Not valid in C++ unless -fno-operator-names is passed.
 #define and foo