diff --git a/drivers/net/mmnif.c b/drivers/net/mmnif.c
index bb723a35..60446879 100644
--- a/drivers/net/mmnif.c
+++ b/drivers/net/mmnif.c
@@ -748,12 +748,10 @@ err_t mmnif_init(struct netif* netif)
 	memset(mmnif->rx_buff, 0, mpb_size);
 
 	mmnif->rx_buff->dcount = MMNIF_MAX_DESCRIPTORS;
-	mmnif->rx_buff->free_bytes_tail = MMNIF_RX_BUFFERLEN;
 
 	/* init the lock's for the hdr
 	 */
 	
-	spinlock_init(&mmnif->rx_buff->wlock);
 	spinlock_init(&mmnif->rx_buff->rlock);
 	spinlock_init(&mmnif->rx_buff->dlock);