diff --git a/core/modules/file/file.js b/core/modules/file/file.js
index 547cb52..4df3ad4 100644
--- a/core/modules/file/file.js
+++ b/core/modules/file/file.js
@@ -160,7 +160,7 @@
             error += '</ul>';
           }
           error += ' ';
-          error += Drupal.t("Only files with the following extensions are allowed: %extensions.", {
+          error += Drupal.t('Only files with the following extensions are allowed: %extensions.', {
             '%extensions': extensionPattern.replace(/\|/g, ', ')
           });
           $(this).closest('div.js-form-managed-file').prepend('<div class="messages messages--error file-upload-js-error" aria-live="polite">' + error + '</div>');