diff -u b/core/modules/taxonomy/taxonomy.test b/core/modules/taxonomy/taxonomy.test
--- b/core/modules/taxonomy/taxonomy.test
+++ b/core/modules/taxonomy/taxonomy.test
@@ -730,7 +730,7 @@
     $field_name = $this->randomName();
     $tag = $this->randomName();
     $message = t("Taxonomy field @field_name not found.", array('@field_name' => $field_name));
-    $this->assertFalse(field_info_field($field_name), t('Field %field_name does not exist.', array('%field_name' => $field_name)));
+    $this->assertFalse(field_info_field($field_name), format_string('Field %field_name does not exist.', array('%field_name' => $field_name)));
     $this->drupalGet('taxonomy/autocomplete/' . $field_name . '/' . $tag);
     $this->assertRaw($message, 'Autocomplete returns correct error message when the taxonomy field does not exist.');
   }