diff --git a/userconfig/cfgfile.py b/userconfig/cfgfile.py
index df9f847..395f9f3 100644
--- a/userconfig/cfgfile.py
+++ b/userconfig/cfgfile.py
@@ -4,7 +4,7 @@ import sys
 
 
 class Conf(object):
-    _confobj = configparser.ConfigParser(os.environ)
+    _confobj = configparser.ConfigParser(dict(HOME=os.environ.get('HOME')))
     _cfgfiles = []
     debug = None
 
@@ -15,6 +15,8 @@ class Conf(object):
         if filename:
             filenames.append(filename)
         if not force_filename:
+            # default config files are $HOME/etc/userconfig2.conf and
+            # {sys.prefix}/etc/userconfig2.conf
             if os.path.isfile(f'{os.environ.get("HOME")}/etc/userconfig2.conf'):
                 filenames.append(f'{os.environ.get("HOME")}/etc/userconfig2.conf')
             if os.path.isfile(f'{sys.prefix}/etc/userconfig2.conf'):
@@ -30,6 +32,7 @@ class Conf(object):
         ret = self._confobj.read(filenames)
         if len(ret) == 0:
             return None
+        self._cfgfiles = ret
         if self.debug:
             self.debug.stdout("Read config files: %s" % ", ".join(filenames), 2)
         return ret