diff --git a/accessible/tests/mochitest/events/test_tree.xul b/accessible/tests/mochitest/events/test_tree.xul
index 342d55ce0fc4..90f72b9fe8c0 100644
--- a/accessible/tests/mochitest/events/test_tree.xul
+++ b/accessible/tests/mochitest/events/test_tree.xul
@@ -232,6 +232,7 @@
     var gQueue = null;
 
     // gA11yEventDumpID = "debug";
+    gA11yEventDumpToConsole = true;
 
     function doTest()
     {