diff --git a/core/modules/image/lib/Drupal/image/Form/ImageStyleFlushForm.php b/core/modules/image/lib/Drupal/image/Form/ImageStyleFlushForm.php
index 6235c95..4e3a9ff 100644
--- a/core/modules/image/lib/Drupal/image/Form/ImageStyleFlushForm.php
+++ b/core/modules/image/lib/Drupal/image/Form/ImageStyleFlushForm.php
@@ -33,14 +33,14 @@ public function getFormID() {
    * {@inheritdoc}
    */
   public function getQuestion() {
-    return t('Are you sure you want to flush image derivatives for %name image style?', array('%name' => $this->image_style->label()));
+    return $this->t('Are you sure you want to flush image derivatives for %name image style?', array('%name' => $this->image_style->label()));
   }
 
   /**
    * {@inheritdoc}
    */
   public function getDescription() {
-    return t('This action cannot be undone. Image derivatives will be magically recreated as they are requested.');
+    return $this->t('This action cannot be undone. Image derivatives will be magically recreated as they are requested.');
   }
 
   /**
@@ -73,7 +73,7 @@ public function buildForm(array $form, array &$form_state, ImageStyleInterface $
    */
   public function submitForm(array &$form, array &$form_state) {
     $this->image_style->flush();
-    drupal_set_message(t('The image style %name has been flushed.', array('%name' => $this->image_style->label())));
+    drupal_set_message($this->t('The image style %name has been flushed.', array('%name' => $this->image_style->label())));
     $form_state['redirect'] = 'admin/config/media/image-styles';
   }