diff --git a/modoboa/extensions/amavis/management/commands/amnotify.py b/modoboa/extensions/amavis/management/commands/amnotify.py
index d9962b93f..577a81308 100644
--- a/modoboa/extensions/amavis/management/commands/amnotify.py
+++ b/modoboa/extensions/amavis/management/commands/amnotify.py
@@ -44,7 +44,7 @@ class Command(BaseCommand, CloseConnectionMixin):
     def handle(self, *args, **options):
         if options["baseurl"] is None:
             raise CommandError("You must provide the --baseurl option")
-        Amavis.load()
+        Amavis().load()
         self.options = options
         self.notify_admins_pending_requests()
 
diff --git a/modoboa/extensions/amavis/management/commands/qcleanup.py b/modoboa/extensions/amavis/management/commands/qcleanup.py
index 34dcdc060..eaf1ed283 100644
--- a/modoboa/extensions/amavis/management/commands/qcleanup.py
+++ b/modoboa/extensions/amavis/management/commands/qcleanup.py
@@ -35,7 +35,7 @@ class Command(BaseCommand, CloseConnectionMixin):
         print msg
 
     def handle(self, *args, **options):
-        Amavis.load()
+        Amavis().load()
         if options["debug"]:
             import logging
             l = logging.getLogger("django.db.backends")
diff --git a/modoboa/extensions/postfix_autoreply/management/commands/autoreply.py b/modoboa/extensions/postfix_autoreply/management/commands/autoreply.py
index 44d2ed172..0dd3ecd23 100644
--- a/modoboa/extensions/postfix_autoreply/management/commands/autoreply.py
+++ b/modoboa/extensions/postfix_autoreply/management/commands/autoreply.py
@@ -53,7 +53,7 @@ class Command(BaseCommand, CloseConnectionMixin):
             raise CommandError(
                 "usage: ./manage.py autoreply <sender> <recipient ...>")
 
-        PostfixAutoreply.load()
+        PostfixAutoreply().load()
         sender = args[0]
         for fulladdress in args[1:]:
             address, domain = split_mailbox(fulladdress)
diff --git a/modoboa/extensions/radicale/management/commands/generate_rights.py b/modoboa/extensions/radicale/management/commands/generate_rights.py
index 25365c514..58663a855 100644
--- a/modoboa/extensions/radicale/management/commands/generate_rights.py
+++ b/modoboa/extensions/radicale/management/commands/generate_rights.py
@@ -103,7 +103,7 @@ permission = %s
 
     def handle(self, *args, **options):
         """Command entry point."""
-        Radicale.load()
+        Radicale().load()
         path = parameters.get_admin("RIGHTS_FILE_PATH", app="radicale")
         if not options["force"]:
             try:
diff --git a/modoboa/extensions/stats/management/commands/logparser.py b/modoboa/extensions/stats/management/commands/logparser.py
index 089c374ab..e898d338c 100644
--- a/modoboa/extensions/stats/management/commands/logparser.py
+++ b/modoboa/extensions/stats/management/commands/logparser.py
@@ -373,7 +373,7 @@ class Command(BaseCommand, CloseConnectionMixin):
     )
 
     def handle(self, *args, **options):
-        Stats.load()
+        Stats().load()
         if options["logfile"] is None:
             options["logfile"] = parameters.get_admin("LOGFILE", app="stats")
         p = LogParser(options, parameters.get_admin("RRD_ROOTDIR", app="stats"))