diff --git a/bin/tests/task_test.c b/bin/tests/task_test.c
index 5232845870..1f05fd50e6 100644
--- a/bin/tests/task_test.c
+++ b/bin/tests/task_test.c
@@ -172,7 +172,7 @@ main(int argc, char *argv[]) {
 	isc_task_purgerange(t3,
 			    NULL,
 			    ISC_EVENTTYPE_FIRSTEVENT,
-			    ISC_EVENTTYPE_LASTEVENT);
+			    ISC_EVENTTYPE_LASTEVENT, 0);
 
 	isc_task_detach(&t1);
 	isc_task_detach(&t2);