diff --git a/lego/sys/timewheel/timewheel.go b/lego/sys/timewheel/timewheel.go
index 4dd421394..2e0f2acbd 100644
--- a/lego/sys/timewheel/timewheel.go
+++ b/lego/sys/timewheel/timewheel.go
@@ -185,7 +185,10 @@ func (this *TimeWheel) handleTick() {
 		}
 
 		if task.async {
-			go this.calltask(task, task.args...)
+			go func(task *Task) {
+				go this.calltask(task, task.args...)
+			}(task)
+
 		} else {
 			// optimize gopool
 			this.calltask(task, task.args...)