diff --git a/google-beta/resource_container_cluster.go b/google-beta/resource_container_cluster.go
index 8370d41a74..ec68049822 100644
--- a/google-beta/resource_container_cluster.go
+++ b/google-beta/resource_container_cluster.go
@@ -212,8 +212,9 @@ func resourceContainerCluster() *schema.Resource {
 									},
 									"auth": {
 										Type:         schema.TypeString,
+										Default:      "AUTH_NONE",
 										Optional:     true,
-										ValidateFunc: validation.StringInSlice([]string{"AUTH_MUTUAL_TLS"}, false),
+										ValidateFunc: validation.StringInSlice([]string{"AUTH_NONE", "AUTH_MUTUAL_TLS"}, false),
 									},
 								},
 							},