diff --git a/debian/debian_config.py b/debian/debian_config.py
index 6c22868..c19d13f 100644
--- a/debian/debian_config.py
+++ b/debian/debian_config.py
@@ -4,9 +4,6 @@ import os
 
 PROJECT_NAME = 'fargo'
 
-# SAML2 authentication
-INSTALLED_APPS += ('mellon',)
-
 #
 # hobotization (multitenant)
 #
diff --git a/fargo/settings.py b/fargo/settings.py
index 9b54b6e..604820b 100644
--- a/fargo/settings.py
+++ b/fargo/settings.py
@@ -125,6 +125,7 @@ LOGOUT_URL = '/logout/'
 # Authentication settings
 try:
     import mellon
+    INSTALLED_APPS = INSTALLED_APPS + ('mellon',)
 except ImportError:
     mellon = None