diff --git a/hgext/remotefilelog/remotefilelogserver.py b/hgext/remotefilelog/remotefilelogserver.py
--- a/hgext/remotefilelog/remotefilelogserver.py
+++ b/hgext/remotefilelog/remotefilelogserver.py
@@ -186,7 +186,7 @@
                         yield (t, u, e, s)
 
             for x in repo.store.topfiles():
-                if state.noflatmf and x[0][:11] == b'00manifest.':
+                if state.noflatmf and x[1][:11] == b'00manifest.':
                     continue
                 yield x