diff --git a/drivers/net/macb.c b/drivers/net/macb.c
index 81bf005..1d210ed 100644
--- a/drivers/net/macb.c
+++ b/drivers/net/macb.c
@@ -148,7 +148,7 @@
 
 			if (phydev->duplex)
 				reg |= MACB_BIT(FD);
-			if (phydev->speed)
+			if (phydev->speed == SPEED_100)
 				reg |= MACB_BIT(SPD);
 
 			macb_writel(bp, NCFGR, reg);