diff --git a/src/xmpp/avatar.c b/src/xmpp/avatar.c
index fb69424c..8ecc86fa 100644
--- a/src/xmpp/avatar.c
+++ b/src/xmpp/avatar.c
@@ -35,6 +35,7 @@
 
 #include <glib.h>
 #include <stdio.h>
+#include <stdlib.h>
 #include <errno.h>
 #include <sys/stat.h>