diff --git a/bsp/simlinux/drivers/sd_sim.c b/bsp/simlinux/drivers/sd_sim.c
index 7c9844bae3..1f39843d3e 100755
--- a/bsp/simlinux/drivers/sd_sim.c
+++ b/bsp/simlinux/drivers/sd_sim.c
@@ -1,7 +1,7 @@
 #include <rtthread.h>
 #include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
+//#include <stdlib.h>
+//#include <string.h>
 #include <dfs_def.h>
 
 // #define SD_TRACE     rt_kprintf