diff --git a/core/modules/system/src/Tests/System/SiteMaintenanceTest.php b/core/modules/system/src/Tests/System/SiteMaintenanceTest.php
index 0f9d15b..95e4747 100644
--- a/core/modules/system/src/Tests/System/SiteMaintenanceTest.php
+++ b/core/modules/system/src/Tests/System/SiteMaintenanceTest.php
@@ -41,7 +41,7 @@ protected function setUp() {
   /**
    * Verify site maintenance mode functionality.
    */
-  protected function TestSiteMaintenance() {
+  protected function testSiteMaintenance() {
     // Turn on maintenance mode.
     $edit = array(
       'maintenance_mode' => 1,