diff --git a/src/event/client_events.c b/src/event/client_events.c
index a1cff93d..e9a42d32 100644
--- a/src/event/client_events.c
+++ b/src/event/client_events.c
@@ -32,6 +32,7 @@
  *
  */
 
+#include <stdlib.h>
 #include <glib.h>
 
 #include "config.h"