diff --git a/reactos/base/applications/cmdutils/tree/tree.c b/reactos/base/applications/cmdutils/tree/tree.c
index a422a9ed310..220318a4176 100644
--- a/reactos/base/applications/cmdutils/tree/tree.c
+++ b/reactos/base/applications/cmdutils/tree/tree.c
@@ -7,7 +7,7 @@
 
 // Tree.cpp : Defines the entry point for the console application.
 //
-#include <Windows.h>
+#include <windows.h>
 #include <stdio.h>
 
 #define STR_MAX 2048