diff --git a/gtk/gtkstatusicon.c b/gtk/gtkstatusicon.c
index efecdadc28..5c8a591fb8 100644
--- a/gtk/gtkstatusicon.c
+++ b/gtk/gtkstatusicon.c
@@ -28,6 +28,7 @@
 #include "config.h"
 
 #include <string.h>
+#include <stdlib.h>
 
 #include "gtkstatusicon.h"