diff --git a/mercurial/cmdutil.py b/mercurial/cmdutil.py
--- a/mercurial/cmdutil.py
+++ b/mercurial/cmdutil.py
@@ -2227,8 +2227,9 @@ def displaygraph(ui, repo, dag, displaye
         'missing': graphmod.MISSINGPARENT
     }
     for name, key in edgetypes.items():
-        # experimental config: ui.graphstyle.*
-        styles[key] = ui.config('ui', 'graphstyle.%s' % name, styles[key])
+        # experimental config: experimental.graphstyle.*
+        styles[key] = ui.config('experimental', 'graphstyle.%s' % name,
+                                styles[key])
         if not styles[key]:
             styles[key] = None
     for rev, type, ctx, parents in dag:
diff --git a/tests/test-glog.t b/tests/test-glog.t
--- a/tests/test-glog.t
+++ b/tests/test-glog.t
@@ -2420,7 +2420,7 @@ change graph edge styling
 
   $ cd repo
   $ cat << EOF >> $HGRCPATH
-  > [ui]
+  > [experimental]
   > graphstyle.parent = |
   > graphstyle.grandparent = :
   > graphstyle.missing =