diff --git a/drivers/net/mmnif.c b/drivers/net/mmnif.c
index 25589bf2..e8250d01 100644
--- a/drivers/net/mmnif.c
+++ b/drivers/net/mmnif.c
@@ -903,8 +903,8 @@ err_t mmnif_init(struct netif* netif)
 
 	/* init the lock for the hdr
 	 */
-	sem_init(&mmnif->rx_buff->lock,1);
- //       spinlock_init(&mmnif->rx_buff->lock);
+//	sem_init(&mmnif->rx_buff->lock,1);
+        spinlock_init(&mmnif->rx_buff->lock);
 
 	/* init the sems for communication art
 	 */