diff --git a/src/cairo-win32-private.h b/src/cairo-win32-private.h
diff --git a/src/cairoint.h b/src/cairoint.h
index 3dc0f7e..960cbb0 100644
--- a/src/cairoint.h
+++ b/src/cairoint.h
@@ -142,6 +142,7 @@ CAIRO_BEGIN_DECLS
 
 #if !defined(CAIRO_MUTEX_DECLARE) && defined CAIRO_HAS_WIN32_SURFACE
 # define WIN32_LEAN_AND_MEAN
+#define WINVER 0x0500
 # include <windows.h>
   /* the real initialization must take place in DllMain */
 # define CAIRO_MUTEX_DECLARE(name) extern CRITICAL_SECTION name;