diff --git a/pkg/syncer/server.go b/pkg/syncer/server.go
index 549ef1da619..d7daefc6f5b 100644
--- a/pkg/syncer/server.go
+++ b/pkg/syncer/server.go
@@ -80,12 +80,11 @@ type RegionSyncer struct {
 		clientCtx    context.Context
 		clientCancel context.CancelFunc
 	}
-	broadcastDone chan struct{}
-	server        Server
-	wg            sync.WaitGroup
-	history       *historyBuffer
-	limit         *ratelimit.RateLimiter
-	tlsConfig     *grpcutil.TLSConfig
+	server    Server
+	wg        sync.WaitGroup
+	history   *historyBuffer
+	limit     *ratelimit.RateLimiter
+	tlsConfig *grpcutil.TLSConfig
 	// status when as client
 	streamingRunning atomic.Bool
 }
@@ -98,11 +97,10 @@ func NewRegionSyncer(s Server) *RegionSyncer {
 		return nil
 	}
 	syncer := &RegionSyncer{
-		server:        s,
-		history:       newHistoryBuffer(defaultHistoryBufferSize, regionStorage.(kv.Base)),
-		limit:         ratelimit.NewRateLimiter(defaultBucketRate, defaultBucketCapacity),
-		tlsConfig:     s.GetTLSConfig(),
-		broadcastDone: make(chan struct{}, 1),
+		server:    s,
+		history:   newHistoryBuffer(defaultHistoryBufferSize, regionStorage.(kv.Base)),
+		limit:     ratelimit.NewRateLimiter(defaultBucketRate, defaultBucketCapacity),
+		tlsConfig: s.GetTLSConfig(),
 	}
 	syncer.mu.streams = make(map[string]ServerStream)
 	return syncer
@@ -348,6 +346,7 @@ func (s *RegionSyncer) bindStream(name string, stream ServerStream) {
 }
 
 func (s *RegionSyncer) broadcast(ctx context.Context, regions *pdpb.SyncRegionResponse) {
+	broadcastDone := make(chan struct{}, 1)
 	go func() {
 		defer logutil.LogPanic()
 		var failed []string
@@ -368,10 +367,10 @@ func (s *RegionSyncer) broadcast(ctx context.Context, regions *pdpb.SyncRegionRe
 			}
 			s.mu.Unlock()
 		}
-		s.broadcastDone <- struct{}{}
+		close(broadcastDone)
 	}()
 	select {
-	case <-s.broadcastDone:
+	case <-broadcastDone:
 	case <-ctx.Done():
 	}
 }