diff --git a/drivers/infiniband/ulp/ipoib/ipoib_multicast.c b/drivers/infiniband/ulp/ipoib/ipoib_multicast.c
index ffb83b5f7e80..eee66d13e5b9 100644
--- a/drivers/infiniband/ulp/ipoib/ipoib_multicast.c
+++ b/drivers/infiniband/ulp/ipoib/ipoib_multicast.c
@@ -190,12 +190,6 @@ static int ipoib_mcast_join_finish(struct ipoib_mcast *mcast,
 		spin_unlock_irq(&priv->lock);
 		priv->tx_wr.wr.ud.remote_qkey = priv->qkey;
 		set_qkey = 1;
-
-		if (!ipoib_cm_admin_enabled(dev)) {
-			rtnl_lock();
-			dev_set_mtu(dev, min(priv->mcast_mtu, priv->admin_mtu));
-			rtnl_unlock();
-		}
 	}
 
 	if (!test_bit(IPOIB_MCAST_FLAG_SENDONLY, &mcast->flags)) {
@@ -371,6 +365,8 @@ void ipoib_mcast_carrier_on_task(struct work_struct *work)
 	}
 
 	rtnl_lock();
+	if (!ipoib_cm_admin_enabled(priv->dev))
+		dev_set_mtu(priv->dev, min(priv->mcast_mtu, priv->admin_mtu));
 	netif_carrier_on(priv->dev);
 	rtnl_unlock();
 }