diff --git a/core/modules/locale/lib/Drupal/locale/Tests/LocaleFileImportStatus.php b/core/modules/locale/lib/Drupal/locale/Tests/LocaleFileImportStatus.php
index 2406b2d..a822d48 100644
--- a/core/modules/locale/lib/Drupal/locale/Tests/LocaleFileImportStatus.php
+++ b/core/modules/locale/lib/Drupal/locale/Tests/LocaleFileImportStatus.php
@@ -187,7 +187,7 @@ class LocaleFileImportStatus extends WebTestBase {
     variable_set('locale_translate_file_directory', $dir);
     $langcode = 'de';
     $this->addLanguage($langcode);
-    $file_uri = tempnam($dir, "po_") . '.' . $langcode . '.po';
+    $file_uri = 'translations://po_'. $this->randomString() .'.'. $langcode .'.po';
     file_put_contents($file_uri, $this->randomString());
     $this->assertTrue(is_file($file_uri), 'Translation file is created.');
     language_delete($langcode);