diff --git a/store/copr/batch_coprocessor.go b/store/copr/batch_coprocessor.go
index dae965d912900..c719aea90b3b0 100644
--- a/store/copr/batch_coprocessor.go
+++ b/store/copr/batch_coprocessor.go
@@ -768,6 +768,10 @@ func (b *batchCopIterator) retryBatchCopTask(ctx context.Context, bo *backoff.Ba
 			ranges = append(ranges, *ran)
 		})
 	}
+	// need to make sure the key ranges is sorted
+	sort.Slice(ranges, func(i, j int) bool {
+		return bytes.Compare(ranges[i].StartKey, ranges[j].StartKey) < 0
+	})
 	return buildBatchCopTasks(bo, b.store, NewKeyRanges(ranges), b.req.StoreType, nil, 0, false, 0)
 }