diff --git a/sys/src/9/port/devether.c b/sys/src/9/port/devether.c
index bff515611..fee6a07c8 100644
--- a/sys/src/9/port/devether.c
+++ b/sys/src/9/port/devether.c
@@ -415,7 +415,7 @@ Nope:
 	}
 	ether->type = cards[cardno].type;
 
-	print("#l%d: %s: %dMbps port 0x%luX irq %d ea %E\n",
+	print("#l%d: %s: %dMbps port 0x%lluX irq %d ea %E\n",
 		ctlrno, ether->type, ether->mbps, ether->port, ether->irq, ether->ea);
 
 	/* compute log10(ether->mbps) into lg */