diff --git a/core/modules/config_translation/src/Controller/ConfigTranslationController.php b/core/modules/config_translation/src/Controller/ConfigTranslationController.php
index 0791e6c..2dc7603 100644
--- a/core/modules/config_translation/src/Controller/ConfigTranslationController.php
+++ b/core/modules/config_translation/src/Controller/ConfigTranslationController.php
@@ -129,7 +129,7 @@ public function itemPage(Request $request, RouteMatchInterface $route_match, $pl
 
     $languages = $this->languageManager->getLanguages();
     if (count($languages) == 1) {
-      drupal_set_message($this->t('In order to translate configuration, the website must have at least two <a href="@url">languages</a>.', array('@url' => $this->url('entity.configurable_language.collection'))));
+      drupal_set_message($this->t('In order to translate configuration, the website must have at least two <a href="@url">languages</a>.', array('@url' => $this->url('entity.configurable_language.collection'))), 'warning');
     }
     $original_langcode = $mapper->getLangcode();
     if (!isset($languages[$original_langcode])) {