diff --git a/components/utilities/ulog/ulog.c b/components/utilities/ulog/ulog.c
index 76100892982dde363d1e80b7439dc57a1c06d530..e2685afbbd787156aa1fc817f5701e51de9c0724 100644
--- a/components/utilities/ulog/ulog.c
+++ b/components/utilities/ulog/ulog.c
@@ -7,7 +7,7 @@
  * Date           Author       Notes
  * 2018-08-25     armink       the first version
  */
-
+#include <stdlib.h>
 #include <stdarg.h>
 #include "ulog.h"
 #include "rthw.h"