diff --git a/routers/repo/download.go b/routers/repo/download.go
index c5e18e005..b1c5fbc84 100644
--- a/routers/repo/download.go
+++ b/routers/repo/download.go
@@ -27,7 +27,6 @@ func ServeBlob(ctx *middleware.Context, blob *git.Blob) error {
 
 	_, isTextFile := base.IsTextFile(buf)
 	_, isImageFile := base.IsImageFile(buf)
-	ctx.Resp.Header().Set("Content-Type", "text/plain")
 	if !isTextFile && !isImageFile {
 		ctx.Resp.Header().Set("Content-Disposition", "attachment; filename="+path.Base(ctx.Repo.TreeName))
 		ctx.Resp.Header().Set("Content-Transfer-Encoding", "binary")