diff --git a/clang/test/Frontend/rewrite-includes-macros.cpp b/clang/test/Frontend/rewrite-includes-macros.cpp
--- a/clang/test/Frontend/rewrite-includes-macros.cpp
+++ b/clang/test/Frontend/rewrite-includes-macros.cpp
@@ -1,7 +1,8 @@
-// REQUIRES: system-windows
-// RUN: %clang_cl /E -Xclang -frewrite-includes %s | %clang_cl /c -Xclang -verify /Tp -
+// RUN: %clang_cl /E -Xclang -frewrite-includes -- %s | %clang_cl /c -Xclang -verify /Tp -
 // expected-no-diagnostics
 
+// This test uses dos-style \r\n line endings.
+// Make sure your editor doesn't rewrite them to unix-style \n line endings.
 int foo();
 int bar();
 #define HELLO \