diff --git a/src/applets/close.c b/src/applets/close.c
index 2987a61..77939aa 100644
--- a/src/applets/close.c
+++ b/src/applets/close.c
@@ -22,6 +22,7 @@
 #include <libintl.h>
 #include <gdk/gdkx.h>
 #include <X11/Xatom.h>
+#include <System.h>
 #include "Panel/applet.h"
 #define _(string) gettext(string)