diff --git a/reactos/base/applications/charmap/precomp.h b/reactos/base/applications/charmap/precomp.h
index 040886cefd7..540cd9f6cb6 100644
--- a/reactos/base/applications/charmap/precomp.h
+++ b/reactos/base/applications/charmap/precomp.h
@@ -4,6 +4,7 @@
 #include <stdio.h>
 #include <commctrl.h>
 #include "resource.h"
+#include <stdlib.h>
 
 #define XCELLS 20
 #define YCELLS 10