diff --git a/server/schedulers/hot_region_config.go b/server/schedulers/hot_region_config.go
index 60edbb9fd454..27346abf486e 100644
--- a/server/schedulers/hot_region_config.go
+++ b/server/schedulers/hot_region_config.go
@@ -81,7 +81,7 @@ type hotRegionSchedulerConfig struct {
 	WritePriorities        []string `json:"write-priorities"`
 
 	// Separately control whether to start hotspot scheduling for TiFlash
-	EnableForTiFlash bool `json:"enable-for-tiflash"`
+	EnableForTiFlash bool `json:"enable-for-tiflash,string"`
 }
 
 func (conf *hotRegionSchedulerConfig) EncodeConfig() ([]byte, error) {