diff --git a/weed/filer/filechunks_test.go b/weed/filer/filechunks_test.go
index e2aadf516..b0cd31d5a 100644
--- a/weed/filer/filechunks_test.go
+++ b/weed/filer/filechunks_test.go
@@ -181,8 +181,8 @@ func TestIntervalMerging(t *testing.T) {
 		{
 			Chunks: []*filer_pb.FileChunk{
 				{Offset: 0, Size: 100, FileId: "abc", Fid: &filer_pb.FileId{FileKey: 1}, ModifiedTsNs: 123},
-				{Offset: 0, Size: 100, FileId: "axf", Fid: &filer_pb.FileId{FileKey: 2}, ModifiedTsNs: 123},
-				{Offset: 0, Size: 100, FileId: "xyz", Fid: &filer_pb.FileId{FileKey: 3}, ModifiedTsNs: 123},
+				{Offset: 0, Size: 100, FileId: "axf", Fid: &filer_pb.FileId{FileKey: 2}, ModifiedTsNs: 124},
+				{Offset: 0, Size: 100, FileId: "xyz", Fid: &filer_pb.FileId{FileKey: 3}, ModifiedTsNs: 125},
 			},
 			Expected: []*VisibleInterval{
 				{start: 0, stop: 100, fileId: "xyz"},