diff --git a/server/upstream/upstream.go b/server/upstream/upstream.go
index 7481045..da97021 100644
--- a/server/upstream/upstream.go
+++ b/server/upstream/upstream.go
@@ -119,9 +119,9 @@ func (o *Options) Upstream(ctx *fasthttp.RequestCtx, giteaClient *gitea.Client,
 			optionsForNotFoundPages.appendTrailingSlash = false
 			for _, notFoundPage := range upstreamNotFoundPages {
 				optionsForNotFoundPages.TargetPath = "/" + notFoundPage
-				if optionsForNotFoundPages.Upstream(ctx, giteaRoot, giteaAPIToken, branchTimestampCache, fileResponseCache) {
-					_ = fileResponseCache.Set(uri+"?timestamp="+strconv.FormatInt(o.BranchTimestamp.Unix(), 10), fileResponse{
-						exists: false,
+				if optionsForNotFoundPages.Upstream(ctx, giteaClient, branchTimestampCache, fileResponseCache) {
+					_ = fileResponseCache.Set(uri+"?timestamp="+o.timestamp(), gitea.FileResponse{
+						Exists: false,
 					}, fileCacheTimeout)
 					return true
 				}