diff -r 593ad8df9dd2 -r d227451ee280 mercurial/wireproto.py
--- a/mercurial/wireproto.py	Fri Jun 30 03:44:09 2017 +0200
+++ b/mercurial/wireproto.py	Fri Jun 30 03:44:10 2017 +0200
@@ -842,7 +842,7 @@
                               hint=bundle2requiredhint)
 
     try:
-        if repo.ui.configbool('server', 'disablefullbundle', False):
+        if repo.ui.configbool('server', 'disablefullbundle'):
             # Check to see if this is a full clone.
             clheads = set(repo.changelog.heads())
             heads = set(opts.get('heads', set()))