diff --git a/mercurial/hgweb/hgweb_mod.py b/mercurial/hgweb/hgweb_mod.py
--- a/mercurial/hgweb/hgweb_mod.py
+++ b/mercurial/hgweb/hgweb_mod.py
@@ -1177,4 +1177,4 @@ class hgweb(object):
 
     def do_stream_out(self, req):
         req.httphdr("application/mercurial-0.1")
-        streamclone.stream_out(self.repo, req)
+        streamclone.stream_out(self.repo, req, untrusted=True)