diff --git a/drivers/net/rckemac.c b/drivers/net/rckemac.c
index e5a80930..24aa7d34 100644
--- a/drivers/net/rckemac.c
+++ b/drivers/net/rckemac.c
@@ -226,7 +226,7 @@ static err_t rckemacif_output(struct netif* netif, struct pbuf* p)
 
 	/* check for over/underflow */
 	if (BUILTIN_EXPECT((p->tot_len < 20 /* IP header size */) || (p->tot_len > 1536), 0)) {
-		LWIP_DEBUGF(NETIF_DEBUG, ("rckemacif_output: illegal packet length %d => drop\n", p->len));
+		LWIP_DEBUGF(NETIF_DEBUG, ("rckemacif_output: illegal packet length %d => drop\n", p->tot_len));
 		return ERR_IF;
 	}