diff --git a/weed/server/filer_server_handlers_read.go b/weed/server/filer_server_handlers_read.go
index f90b070a2..cdfdf9b49 100644
--- a/weed/server/filer_server_handlers_read.go
+++ b/weed/server/filer_server_handlers_read.go
@@ -79,7 +79,7 @@ func (fs *FilerServer) GetOrHeadHandler(w http.ResponseWriter, r *http.Request,
 		w.Header().Set("Last-Modified", entry.Attr.Mtime.UTC().Format(http.TimeFormat))
 		if r.Header.Get("If-Modified-Since") != "" {
 			if t, parseError := time.Parse(http.TimeFormat, r.Header.Get("If-Modified-Since")); parseError == nil {
-				if t.After(entry.Attr.Mtime) {
+				if t.After(entry.Attr.Mtime) || t.Equal(entry.Attr.Mtime) {
 					w.WriteHeader(http.StatusNotModified)
 					return
 				}