diff --git a/pkg/schedule/coordinator.go b/pkg/schedule/coordinator.go
index 3708acf12a78..ece4162a7c95 100644
--- a/pkg/schedule/coordinator.go
+++ b/pkg/schedule/coordinator.go
@@ -160,7 +160,7 @@ func (c *Coordinator) PatrolRegions() {
 	defer ticker.Stop()
 
 	workersCount := c.cluster.GetCheckerConfig().GetPatrolRegionConcurrency()
-	regionChan := make(chan *core.RegionInfo, c.cluster.GetCheckerConfig().GetPatrolRegionConcurrency())
+	regionChan := make(chan *core.RegionInfo, 65536)
 	quit := make(chan bool)
 	var wg sync.WaitGroup
 	c.startPatrolRegionWorkers(workersCount, regionChan, quit, &wg)