diff --git a/store/mockstore/mocktikv/rpc.go b/store/mockstore/mocktikv/rpc.go
index eb1afed758b3b..c7cdeee95c33d 100644
--- a/store/mockstore/mocktikv/rpc.go
+++ b/store/mockstore/mocktikv/rpc.go
@@ -248,8 +248,8 @@ func (h *rpcHandler) handleKvScan(req *kvrpcpb.ScanRequest) *kvrpcpb.ScanRespons
 	if !h.checkKeyInRegion(req.GetStartKey()) {
 		panic("KvScan: startKey not in region")
 	}
-	endKey := h.endKey
-	if len(req.EndKey) > 0 && (len(endKey) == 0 || bytes.Compare(req.EndKey, endKey) < 0) {
+	endKey := MvccKey(h.endKey).Raw()
+	if len(req.EndKey) > 0 && (len(endKey) == 0 || bytes.Compare(NewMvccKey(req.EndKey), h.endKey) < 0) {
 		endKey = req.EndKey
 	}
 	pairs := h.mvccStore.Scan(req.GetStartKey(), endKey, int(req.GetLimit()), req.GetVersion(), h.isolationLevel)