diff --git a/core/modules/contact/src/MessageForm.php b/core/modules/contact/src/MessageForm.php
index 774de46..edc7bd9 100644
--- a/core/modules/contact/src/MessageForm.php
+++ b/core/modules/contact/src/MessageForm.php
@@ -159,7 +159,7 @@ public function actions(array $form, FormStateInterface $form_state) {
       '#type' => 'submit',
       '#value' => $this->t('Preview'),
       '#validate' => array('::validate'),
-      '#submit' => array('::preview'),
+      '#submit' => ['::preview'],
     );
     return $elements;
   }
diff --git a/core/modules/language/src/Form/LanguageAddForm.php b/core/modules/language/src/Form/LanguageAddForm.php
index a719828..65485b3 100644
--- a/core/modules/language/src/Form/LanguageAddForm.php
+++ b/core/modules/language/src/Form/LanguageAddForm.php
@@ -53,7 +53,7 @@ public function form(array $form, FormStateInterface $form_state) {
         ),
       ),
       '#validate' => array('::validatePredefined'),
-      '#submit' => array('::save'),
+      '#submit' => ['::save'],
     );
 
     $custom_language_states_conditions = array(
@@ -76,7 +76,7 @@ public function form(array $form, FormStateInterface $form_state) {
       '#type' => 'submit',
       '#value' => $this->t('Add custom language'),
       '#validate' => array('::validateCustom'),
-      '#submit' => array('::save'),
+      '#submit' => ['::save'],
     );
 
     return $form;
diff --git a/core/modules/views_ui/src/ViewAddForm.php b/core/modules/views_ui/src/ViewAddForm.php
index 6d292c5..36f3c87 100644
--- a/core/modules/views_ui/src/ViewAddForm.php
+++ b/core/modules/views_ui/src/ViewAddForm.php
@@ -151,7 +151,7 @@ protected function actions(array $form, FormStateInterface $form_state) {
     $actions['submit'] = array(
       '#type' => 'submit',
       '#value' => $this->t('Save and edit'),
-      '#validate' => array('::validate'),
+      '#validate' => ['::validate'],
     );
     $actions['cancel'] = array(
       '#type' => 'submit',