diff --git a/pylons_app/lib/middleware/simplehg.py b/pylons_app/lib/middleware/simplehg.py
--- a/pylons_app/lib/middleware/simplehg.py
+++ b/pylons_app/lib/middleware/simplehg.py
@@ -63,7 +63,7 @@ class SimpleHg(object):
         #===================================================================
         username = REMOTE_USER(environ)
         if not username:
-            self.authenticate.realm = self.config['hg_app_auth_realm']
+            self.authenticate.realm = self.config['hg_app_realm']
             result = self.authenticate(environ)
             if isinstance(result, str):
                 AUTH_TYPE.update(environ, 'basic')