diff --git a/src/transformer/get_event_function_map.php b/src/transformer/get_event_function_map.php
index eda3bf27c..3fb90a698 100644
--- a/src/transformer/get_event_function_map.php
+++ b/src/transformer/get_event_function_map.php
@@ -186,7 +186,7 @@ function get_event_function_map() {
          * which will cause the core_event_deprecated_testcase to fail
          * (debugging already called and the debug mode is off - list_generator.php)
          **/
-        $environmentevents = $availableevents;
+        $environmentevents = array_keys($availableevents);
 
     } else {
         $environmentevents = class_exists("report_eventlist_list_generator") ?