foo.diff

diff --git a/go/vt/vttablet/tabletmanager/rpc_replication.go b/go/vt/vttablet/tabletmanager/rpc_replication.go
index f0eea772f..d226d3a51 100644
--- a/go/vt/vttablet/tabletmanager/rpc_replication.go
+++ b/go/vt/vttablet/tabletmanager/rpc_replication.go
@@ -289,7 +289,7 @@ func (agent *ActionAgent) InitSlave(ctx context.Context, parent *topodatapb.Tabl
 	if err := agent.MysqlDaemon.SetSlavePosition(ctx, pos); err != nil {
 		return err
 	}
-	if err := agent.MysqlDaemon.SetMaster(ctx, topoproto.MysqlHostname(ti.Tablet), int(topoproto.MysqlPort(ti.Tablet)), false /* slaveStopBefore */, true /* slaveStartAfter */); err != nil {
+	if err := agent.MysqlDaemon.SetMaster(ctx, ti.Tablet.Hostname, int(topoproto.MysqlPort(ti.Tablet)), false /* slaveStopBefore */, true /* slaveStartAfter */); err != nil {
 		return err
 	}
 	agent.initReplication = true
@@ -641,7 +641,7 @@ func (agent *ActionAgent) setMasterLocked(ctx context.Context, parentAlias *topo
 	if err != nil {
 		return err
 	}
-	masterHost := topoproto.MysqlHostname(parent.Tablet)
+	masterHost := parent.Tablet.Hostname
 	masterPort := int(topoproto.MysqlPort(parent.Tablet))
 	if status.MasterHost != masterHost || status.MasterPort != masterPort {
 		// This handles both changing the address and starting replication.