diff --git a/core/modules/simpletest/src/WebTestBase.php b/core/modules/simpletest/src/WebTestBase.php
index cb454a1..04d1927 100644
--- a/core/modules/simpletest/src/WebTestBase.php
+++ b/core/modules/simpletest/src/WebTestBase.php
@@ -2680,7 +2680,7 @@ protected function prepareRequestForGenerator($clean_urls = TRUE, $override_serv
    *   Options to be passed to Url::fromUri().
    *
    * @return string
-   *   An absolute URL stsring.
+   *   An absolute URL string.
    */
   protected function buildUrl($path, array $options = array()) {
     if ($path instanceof Url) {