diff --git a/src/Form/FlagDeleteForm.php b/src/Form/FlagDeleteForm.php
index 1177dd7..2f0e932 100644
--- a/src/Form/FlagDeleteForm.php
+++ b/src/Form/FlagDeleteForm.php
@@ -24,7 +24,7 @@ class FlagDeleteForm extends EntityConfirmFormBase {
    * {@inheritdoc}
    */
   public function getQuestion() {
-    return t('Are you sure you want to delete the Flag %label?', [
+    return $this->t('Are you sure you want to delete the Flag %label?', [
       '%label' => $this->entity->label(),
     ]);
   }
@@ -33,7 +33,7 @@ class FlagDeleteForm extends EntityConfirmFormBase {
    * {@inheritdoc}
    */
   public function getConfirmText() {
-    return t('Delete');
+    return $this->t('Delete');
   }
 
   /**
@@ -48,7 +48,7 @@ class FlagDeleteForm extends EntityConfirmFormBase {
    */
   public function submitForm(array &$form, FormStateInterface $form_state) {
     $this->entity->delete();
-    drupal_set_message(t('Flag %label was deleted.', [
+    drupal_set_message($this->t('Flag %label was deleted.', [
      '%label' => $this->entity->label(),
     ]));