diff --git a/pkg/morph/event/listener.go b/pkg/morph/event/listener.go
index 4fb92da50..dd3c7d216 100644
--- a/pkg/morph/event/listener.go
+++ b/pkg/morph/event/listener.go
@@ -621,6 +621,7 @@ func (l *listener) RegisterNotaryHandler(hi NotaryHandlerInfo) {
 func (l *listener) Stop() {
 	l.stopOnce.Do(func() {
 		l.subscriber.Close()
+		l.pool.Release()
 	})
 	l.wg.Wait()
 }