diff --git a/render/font.c b/render/font.c
index d2a4acae..57d838e1 100644
--- a/render/font.c
+++ b/render/font.c
@@ -7,6 +7,7 @@
 #include <X11/Xft/Xft.h>
 #include <glib.h>
 #include <string.h>
+#include <stdlib.h>
 
 #define ELIPSES "..."
 #define ELIPSES_LENGTH(font) \