diff --git a/store/mockstore/mocktikv/cop_handler_dag.go b/store/mockstore/mocktikv/cop_handler_dag.go
index ab6fa5ca8fc46..0e40eb6211b26 100644
--- a/store/mockstore/mocktikv/cop_handler_dag.go
+++ b/store/mockstore/mocktikv/cop_handler_dag.go
@@ -153,7 +153,6 @@ func (h *rpcHandler) buildDAGExecutor(req *coprocessor.Request) (*dagContext, ex
 		if sc.TimeZone, err = LocCache.getLoc(dagReq.TimeZoneName); err != nil {
 			return nil, nil, nil, errors.Trace(err)
 		}
-		dagReq.TimeZoneName = sc.TimeZone.String()
 	} else {
 		sc.TimeZone = time.FixedZone("UTC", int(dagReq.TimeZoneOffset))
 	}