diff --git a/winsup/w32api/include/w32api.h b/winsup/w32api/include/w32api.h
new file mode 100644
index 000000000..3e0631ad7
--- /dev/null
+++ b/winsup/w32api/include/w32api.h
@@ -0,0 +1,6 @@
+#ifndef _W32API_H_
+#define _W32API_H_
+
+#define _W32API_VERSION 0.4
+
+#endif /* ndef _W32API_H_ */