diff --git a/throttle_timer.go b/throttle_timer.go
index 5442d0cd..b19896d5 100644
--- a/throttle_timer.go
+++ b/throttle_timer.go
@@ -47,6 +47,7 @@ func (t *ThrottleTimer) Set() {
 }
 
 func (t *ThrottleTimer) Unset() {
+	atomic.StoreUint32(&t.isSet, 0)
 	t.timer.Stop()
 }