diff --git a/dispatch/dispatch.go b/dispatch/dispatch.go
index b030046d..bad859bb 100644
--- a/dispatch/dispatch.go
+++ b/dispatch/dispatch.go
@@ -258,12 +258,12 @@ func (d *Dispatcher) Stop() {
 		return
 	}
 	d.mtx.Lock()
+	defer d.mtx.Unlock()
 	if d.cancel == nil {
 		return
 	}
 	d.cancel()
 	d.cancel = nil
-	d.mtx.Unlock()
 
 	<-d.done
 }