diff --git a/demo/cmd.c b/demo/cmd.c
index b46e7f0..6811359 100644
--- a/demo/cmd.c
+++ b/demo/cmd.c
@@ -21,7 +21,7 @@
 #include <unistd.h>
 #include <sys/time.h>
 #include <errno.h>
-#include <string.h>
+#include <stdlib.h>
 #include "examples.h"
 
 #define BUFSZ 10000