diff --git a/cmd/kops/rollingupdatecluster.go b/cmd/kops/rollingupdatecluster.go
index dc5e9d0a1f..e77eace623 100644
--- a/cmd/kops/rollingupdatecluster.go
+++ b/cmd/kops/rollingupdatecluster.go
@@ -177,6 +177,7 @@ func NewCmdRollingUpdateCluster(f *util.Factory, out io.Writer) *cobra.Command {
 	cmd.Flags().BoolVar(&options.Force, "force", options.Force, "Force rolling update, even if no changes")
 	cmd.Flags().BoolVar(&options.CloudOnly, "cloudonly", options.CloudOnly, "Perform rolling update without confirming progress with k8s")
 
+	cmd.Flags().DurationVar(&options.ValidationTimeout, "validation-timeout", options.ValidationTimeout, "Maximum time to wait for a cluster to validate")
 	cmd.Flags().DurationVar(&options.MasterInterval, "master-interval", options.MasterInterval, "Time to wait between restarting masters")
 	cmd.Flags().DurationVar(&options.NodeInterval, "node-interval", options.NodeInterval, "Time to wait between restarting nodes")
 	cmd.Flags().DurationVar(&options.BastionInterval, "bastion-interval", options.BastionInterval, "Time to wait between restarting bastions")