diff --git a/core/modules/system/lib/Drupal/system/Tests/Image/ToolkitGdTest.php b/core/modules/system/lib/Drupal/system/Tests/Image/ToolkitGdTest.php
index 1797b78..0e5a730 100644
--- a/core/modules/system/lib/Drupal/system/Tests/Image/ToolkitGdTest.php
+++ b/core/modules/system/lib/Drupal/system/Tests/Image/ToolkitGdTest.php
@@ -222,7 +222,7 @@ function testManipulations() {
         // Load up a fresh image.
         $image = $image_factory->get(drupal_get_path('module', 'simpletest') . '/files/' . $file);
         if (!$image) {
-          $this->fail(t('Could not load image %file.', array('%file' => $file)));
+          $this->fail(format_string('Could not load image %file.', array('%file' => $file)));
           continue 2;
         }