diff --git a/jetstream/jetstream.go b/jetstream/jetstream.go
index 8e000dc..8778e37 100644
--- a/jetstream/jetstream.go
+++ b/jetstream/jetstream.go
@@ -112,5 +112,6 @@ func (e *responseAndEvent) NakWithDelay(delay time.Duration) error {
 	if e.responseSent {
 		return nil
 	}
+	e.responseSent = true
 	return e.m.NakWithDelay(delay)
 }