diff --git a/bsp/simulator/drivers/sd_sim.c b/bsp/simulator/drivers/sd_sim.c
index 758b5e0417..b3b265273d 100755
--- a/bsp/simulator/drivers/sd_sim.c
+++ b/bsp/simulator/drivers/sd_sim.c
@@ -1,7 +1,9 @@
 #include <rtthread.h>
 #include <stdio.h>
-//#include <stdlib.h>
-//#include <string.h>
+#ifdef _WIN32
+#include <stdlib.h>
+#include <string.h>
+#endif
 #include <dfs_def.h>
 
 // #define SD_TRACE     rt_kprintf