diff --git a/clang/test/Headers/unwind.c b/clang/test/Headers/unwind.c
index 2aec9d4c2d89..b2a9265d5fe5 100644
--- a/clang/test/Headers/unwind.c
+++ b/clang/test/Headers/unwind.c
@@ -1,6 +1,5 @@
-// RUN: %clang -target arm-unknown-linux-gnueabi %s -fsyntax-only -o -
-// RUN: %clang -target i686-unknown-linux %s -fsyntax-only -o -
+// RUN: %clang -target arm-unknown-linux-gnueabi -ffreestanding -fsyntax-only %s
+// RUN: %clang -target i686-unknown-linux -ffreestanding -fsyntax-only %s
+// RUN: %clang -ffreestanding -fsyntax-only -x c++ %s
 
 #include "unwind.h"
-// CHECK-NOT: error
-// CHECK-NOT: warning