diff --git a/bsp/simulator/drivers/sd_sim.c b/bsp/simulator/drivers/sd_sim.c
index 4a5739b4b6ffb4403366b59b1def33dcb939b2c3..b317e5428d907e28230bccac61970bcda1b965a5 100755
--- a/bsp/simulator/drivers/sd_sim.c
+++ b/bsp/simulator/drivers/sd_sim.c
@@ -1,11 +1,9 @@
-#include <rtthread.h>
-#include <dfs.h>
-
 #include <stdio.h>
 #include <string.h>
-#ifdef _WIN32
 #include <stdlib.h>
-#endif
+
+#include <rtthread.h>
+#include <dfs.h>
 
 #ifdef DEBUG
 #  define SD_TRACE     rt_kprintf