diff --git a/core/modules/views/lib/Drupal/views/Tests/QueryGroupByTest.php b/core/modules/views/lib/Drupal/views/Tests/QueryGroupByTest.php
index 5193c40..8d38134 100644
--- a/core/modules/views/lib/Drupal/views/Tests/QueryGroupByTest.php
+++ b/core/modules/views/lib/Drupal/views/Tests/QueryGroupByTest.php
@@ -82,7 +82,7 @@ public function testAggregateCount() {
    * @param array $values
    *   The expected views result.
    */
-  public function GroupByTestHelper($aggregation_function, $values) {
+  public function groupByTestHelper($aggregation_function, $values) {
     $this->setupTestEntities();
 
     $view = views_get_view('test_group_by_count');