diff --git a/tests/isc/task_test.c b/tests/isc/task_test.c
index cda67fcb1f..2d5d0d0a8c 100644
--- a/tests/isc/task_test.c
+++ b/tests/isc/task_test.c
@@ -571,7 +571,17 @@ ISC_RUN_TEST_IMPL(basic) {
 
 	atomic_store(&done, true);
 
+	/* Let everything run for 10 seconds. */
 	sleep(10);
+
+	/*
+	 * Disable the timers, let all the already dispatched events to
+	 * complete, and then destroy the timers.
+	 */
+	(void)isc_timer_reset(ti1, isc_timertype_inactive, NULL, NULL, true);
+	(void)isc_timer_reset(ti2, isc_timertype_inactive, NULL, NULL, true);
+	(void)isc_timer_reset(ti3, isc_timertype_inactive, NULL, NULL, true);
+	sleep(4);
 	isc_timer_destroy(&ti1);
 	isc_timer_destroy(&ti2);
 	LOCK(&lock);