diff --git a/reactos/tools/cabman/cabinet.h b/reactos/tools/cabman/cabinet.h
index 5c29d5e1820..105fcfebba2 100644
--- a/reactos/tools/cabman/cabinet.h
+++ b/reactos/tools/cabman/cabinet.h
@@ -8,6 +8,7 @@
 #pragma once
 
 #if defined(_WIN32)
+#define WIN32_LEAN_AND_MEAN
 #include <windows.h>
 #else
 #include <errno.h>