diff --git a/bsp/simulator/drivers/sd_sim.c b/bsp/simulator/drivers/sd_sim.c
index bee76d8be7..8a7619fe7e 100755
--- a/bsp/simulator/drivers/sd_sim.c
+++ b/bsp/simulator/drivers/sd_sim.c
@@ -141,7 +141,7 @@ rt_err_t rt_hw_sdcard_init(const char *spi_device_name)
     device = &(sd->parent);
 
     lock = rt_mutex_create("lock", RT_IPC_FLAG_FIFO);
-    if (lock == RT_NULL) 
+    if (lock == RT_NULL)
     {
         LOG_E("Create mutex in rt_hw_sdcard_init failed!");
         return -RT_ERROR;