diff --git a/lib/Support/Windows/Threading.inc b/lib/Support/Windows/Threading.inc
index 41fdd981fd6..196be890dbf 100644
--- a/lib/Support/Windows/Threading.inc
+++ b/lib/Support/Windows/Threading.inc
@@ -1,4 +1,4 @@
-#include <winbase.h>
+ #include <windows.h>
 
 #ifdef MemoryFence
 // WinNT.h seems to define a MemoryFence macro.