diff --git a/components/fal/src/fal_rtt.c b/components/fal/src/fal_rtt.c
index 98f1c3abe0..3473bc233a 100644
--- a/components/fal/src/fal_rtt.c
+++ b/components/fal/src/fal_rtt.c
@@ -15,6 +15,7 @@
 #include <rtthread.h>
 #include <rtdevice.h>
 #include <string.h>
+#include <stdlib.h>
 
 /* ========================== block device ======================== */
 struct fal_blk_device