diff --git a/drivers/net/mmnif.c b/drivers/net/mmnif.c
index 94629f40..336bfc44 100644
--- a/drivers/net/mmnif.c
+++ b/drivers/net/mmnif.c
@@ -762,7 +762,7 @@ err_t mmnif_tx(struct netif* netif, struct pbuf* p)
 
 #ifdef DEBUG_MMNIF
 	DEBUGPRINTF("\n SEND 0x%.8X\n",(char*)mmnif->rx_buff + 2 + pos * 1792);
-	hex_dump(p->tot_len +2, mmnif->tx_buff[slot]);
+	hex_dump(p->tot_len +2, p->payload);
 #endif
 
 	/* if driver is not in polling mode inform core that a message has arrived */