diff --git a/pkg/protocol/engine/congestioncontrol/scheduler/drr/scheduler.go b/pkg/protocol/engine/congestioncontrol/scheduler/drr/scheduler.go
index 114451d66..37fd2dd2d 100644
--- a/pkg/protocol/engine/congestioncontrol/scheduler/drr/scheduler.go
+++ b/pkg/protocol/engine/congestioncontrol/scheduler/drr/scheduler.go
@@ -388,6 +388,9 @@ loop:
 	for {
 		select {
 		// on close, exit the loop
+		case <-s.shutdownSignal:
+			break loop
+		// on close, exit the loop
 		case <-validatorQueue.shutdownSignal:
 			break loop
 		// when a block is pushed by this validator queue.