diff --git a/unittests/Support/ProcessTest.cpp b/unittests/Support/ProcessTest.cpp
index 27c2318215d..af6a6f921b0 100644
--- a/unittests/Support/ProcessTest.cpp
+++ b/unittests/Support/ProcessTest.cpp
@@ -11,7 +11,7 @@
 #include "gtest/gtest.h"
 
 #ifdef LLVM_ON_WIN32
-#include "windows.h"
+#include <windows.h>
 #endif
 
 namespace {