diff --git a/mercurial/default.d/mergetools.rc b/mercurial/defaultrc/mergetools.rc
rename from mercurial/default.d/mergetools.rc
rename to mercurial/defaultrc/mergetools.rc
diff --git a/mercurial/rcutil.py b/mercurial/rcutil.py
--- a/mercurial/rcutil.py
+++ b/mercurial/rcutil.py
@@ -60,9 +60,9 @@
 
 
 def defaultrcpath():
-    '''return rc paths in default.d'''
+    '''return rc paths in defaultrc'''
     path = []
-    defaultpath = os.path.join(util.datapath, b'default.d')
+    defaultpath = os.path.join(util.datapath, b'defaultrc')
     if os.path.isdir(defaultpath):
         path = _expandrcpath(defaultpath)
     return path