diff --git a/kubernetes/data_source_kubernetes_all_namespaces.go b/kubernetes/data_source_kubernetes_all_namespaces.go
index 4d9d78a410..10a0af6e79 100644
--- a/kubernetes/data_source_kubernetes_all_namespaces.go
+++ b/kubernetes/data_source_kubernetes_all_namespaces.go
@@ -21,8 +21,8 @@ func dataSourceKubernetesAllNamespaces() *schema.Resource {
 		ReadContext: dataSourceKubernetesAllNamespacesRead,
 		Schema: map[string]*schema.Schema{
 			"namespaces": {
-				Type:        schema.TypeList,
-				Description: "List of all namespaces in a cluster.",
+				Type:        schema.TypeSet,
+				Description: "Set of all namespaces in a cluster.",
 				Computed:    true,
 				Elem: &schema.Schema{
 					Type: schema.TypeString,
diff --git a/kubernetes/data_source_kubernetes_all_namespaces_test.go b/kubernetes/data_source_kubernetes_all_namespaces_test.go
index 830108b956..117002ef8f 100644
--- a/kubernetes/data_source_kubernetes_all_namespaces_test.go
+++ b/kubernetes/data_source_kubernetes_all_namespaces_test.go
@@ -13,7 +13,6 @@ import (
 func TestAccKubernetesDataSourceAllNamespaces_basic(t *testing.T) {
 	dataSourceName := "data.kubernetes_all_namespaces.test"
 	rxPosNum := regexp.MustCompile("^[1-9][0-9]*$")
-	nsName := regexp.MustCompile(`^[a-zA-Z][-\w]*$`)
 
 	resource.ParallelTest(t, resource.TestCase{
 		PreCheck:          func() { testAccPreCheck(t) },
@@ -23,8 +22,8 @@ func TestAccKubernetesDataSourceAllNamespaces_basic(t *testing.T) {
 				Config: testAccKubernetesDataSourceAllNamespacesConfig_basic(),
 				Check: resource.ComposeAggregateTestCheckFunc(
 					resource.TestMatchResourceAttr(dataSourceName, "namespaces.#", rxPosNum),
-					resource.TestCheckResourceAttrSet(dataSourceName, "namespaces.0"),
-					resource.TestMatchResourceAttr(dataSourceName, "namespaces.0", nsName),
+					resource.TestCheckTypeSetElemAttr(dataSourceName, "namespaces.*", "default"),
+					resource.TestCheckTypeSetElemAttr(dataSourceName, "namespaces.*", "kube-system"),
 				),
 			},
 		},