diff --git a/mercurial/configitems.py b/mercurial/configitems.py
--- a/mercurial/configitems.py
+++ b/mercurial/configitems.py
@@ -125,6 +125,9 @@ coreconfigitem('server', 'compressioneng
 coreconfigitem('server', 'concurrent-push-mode',
     default='strict',
 )
+coreconfigitem('server', 'disablefullbundle',
+    default=False,
+)
 coreconfigitem('ui', 'clonebundleprefers',
     default=list,
 )
diff --git a/mercurial/wireproto.py b/mercurial/wireproto.py
--- a/mercurial/wireproto.py
+++ b/mercurial/wireproto.py
@@ -842,7 +842,7 @@ def getbundle(repo, proto, others):
                               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()))