diff --git a/aview/main.c b/aview/main.c
index 27cc3ef..83cda6d 100644
--- a/aview/main.c
+++ b/aview/main.c
@@ -2,6 +2,7 @@
 #include "image.h"
 #include "ui.h"
 #include "config.h"
+#include <stdlib.h>
 
 #define NAMELEN 256