diff --git a/README b/README
index 42964a1..ea932bc 100644
--- a/README
+++ b/README
@@ -130,3 +130,11 @@ MAX_ENTITY_FILTER_DEPTH
 USE_PDF_VIEWER
 
     Utiliser la visionneuse de PDF, par défaut False.
+
+Environment
+-----------
+
+FORCE_SOUTH
+
+    If this variable is defined in the environment, you can use south with
+    sqlite.
diff --git a/polynum/settings.py b/polynum/settings.py
index 4680be0..d421300 100644
--- a/polynum/settings.py
+++ b/polynum/settings.py
@@ -1,5 +1,6 @@
 # Django settings for polynum project.
 
+import os
 import os.path
 import django.conf.global_settings as DEFAULT_SETTINGS
 from django.core.urlresolvers import reverse_lazy
@@ -218,7 +219,7 @@ except:
     pass
 
 # use South, unless if database is sqlite3
-if DATABASES['default']['ENGINE'] != 'django.db.backends.sqlite3':
+if DATABASES['default']['ENGINE'] != 'django.db.backends.sqlite3' or 'FORCE_SOUTH' in os.environ:
     INSTALLED_APPS = ('south',) + INSTALLED_APPS
 
 # CAS