diff --git a/client/commands.c b/client/commands.c
index 2dae23e1..29e71418 100644
--- a/client/commands.c
+++ b/client/commands.c
@@ -8,6 +8,7 @@
 
 #include <stdio.h>
 #include <ctype.h>
+#include <stdlib.h>
 
 #include "nest/bird.h"
 #include "lib/resource.h"