diff --git a/core/modules/config_translation/src/Form/ConfigTranslationFormBase.php b/core/modules/config_translation/src/Form/ConfigTranslationFormBase.php
index 7d66e8f..9ccb2e7 100644
--- a/core/modules/config_translation/src/Form/ConfigTranslationFormBase.php
+++ b/core/modules/config_translation/src/Form/ConfigTranslationFormBase.php
@@ -179,7 +179,7 @@ public function buildForm(array $form, FormStateInterface $form_state, Request $
 
       if ($form_element = $this->createFormElement($schema)) {
         $parents = array('config_names', $name);
-        $form['config_name'][$name] += $form_element->getTranslationBuild($this->sourceLanguage, $this->language, $source_config, $translation_config, $parents);
+        $form['config_names'][$name] += $form_element->getTranslationBuild($this->sourceLanguage, $this->language, $source_config, $translation_config, $parents);
       }
     }