diff --git a/net/dsa/slave.c b/net/dsa/slave.c
index f434558..6ebd8fb 100644
--- a/net/dsa/slave.c
+++ b/net/dsa/slave.c
@@ -41,8 +41,8 @@
 	ds->slave_mii_bus->name = "dsa slave smi";
 	ds->slave_mii_bus->read = dsa_slave_phy_read;
 	ds->slave_mii_bus->write = dsa_slave_phy_write;
-	snprintf(ds->slave_mii_bus->id, MII_BUS_ID_SIZE, "%s:%.2x",
-			ds->master_mii_bus->id, ds->pd->sw_addr);
+	snprintf(ds->slave_mii_bus->id, MII_BUS_ID_SIZE, "dsa-%d:%.2x",
+			ds->index, ds->pd->sw_addr);
 	ds->slave_mii_bus->parent = &ds->master_mii_bus->dev;
 }