diff --git a/client/commands.c b/client/commands.c
index 2dae23e1..f2134c1b 100644
--- a/client/commands.c
+++ b/client/commands.c
@@ -7,6 +7,7 @@
  */
 
 #include <stdio.h>
+#include <stdlib.h>
 #include <ctype.h>
 
 #include "nest/bird.h"