diff --git a/modoboa/extensions/limits/__init__.py b/modoboa/extensions/limits/__init__.py
index 2601c97e1..41759d58a 100644
--- a/modoboa/extensions/limits/__init__.py
+++ b/modoboa/extensions/limits/__init__.py
@@ -10,6 +10,7 @@ from django.db import IntegrityError
 from django.contrib.contenttypes.models import ContentType
 from django.utils.translation import ugettext_lazy
 from modoboa.lib import events, parameters
+from modoboa.lib.permissions import add_permissions_to_group
 from modoboa.core.extensions import ModoExtension, exts_pool
 
 levents = [
@@ -38,10 +39,12 @@ class Limits(ModoExtension):
         grp.permissions.add(*dagrp.permissions.all())
 
         ct = ContentType.objects.get_for_model(Domain)
-        for pname in ["view_domains", "add_domain", "change_domain", "delete_domain"]:
-            perm = Permission.objects.get(content_type=ct, codename=pname)
-            grp.permissions.add(perm)
-            grp.save()
+        add_permissions_to_group(
+            "Resellers", [("admin", "view_domains"),
+                          ("admin", "add_domain"),
+                          ("admin", "change_domain"),
+                          ("admin", "delete_domain")]
+        )
 
         for user in User.objects.filter(groups__name='DomainAdmins'):
             try:
diff --git a/modoboa/extensions/radicale/__init__.py b/modoboa/extensions/radicale/__init__.py
index 99f30c228..80fd42225 100644
--- a/modoboa/extensions/radicale/__init__.py
+++ b/modoboa/extensions/radicale/__init__.py
@@ -11,6 +11,21 @@ from modoboa.lib.permissions import add_permissions_to_group
 from modoboa.core.extensions import ModoExtension, exts_pool
 
 
+def init_limits_dependant_features():
+    """Custom initialization if the limits extension activated.
+
+    We mainly define extra permissions.
+    """
+    add_permissions_to_group(
+        "Resellers", [("radicale", "add_usercalendar"),
+                      ("radicale", "change_usercalendar"),
+                      ("radicale", "delete_usercalendar"),
+                      ("radicale", "add_sharedcalendar"),
+                      ("radicale", "change_sharedcalendar"),
+                      ("radicale", "delete_sharedcalendar")]
+    )
+
+
 class Radicale(ModoExtension):
     """
     """
@@ -32,6 +47,8 @@ class Radicale(ModoExtension):
                              ("radicale", "change_sharedcalendar"),
                              ("radicale", "delete_sharedcalendar")]
         )
+        if exts_pool.is_extension_enabled('limits'):
+            init_limits_dependant_features()
 
     def load(self):
         """Plugin loading.
diff --git a/modoboa/extensions/radicale/general_callbacks.py b/modoboa/extensions/radicale/general_callbacks.py
index 86b5e70c0..486c0fb92 100644
--- a/modoboa/extensions/radicale/general_callbacks.py
+++ b/modoboa/extensions/radicale/general_callbacks.py
@@ -13,3 +13,20 @@ def top_menu(target, user):
              "url": reverse('modoboa.extensions.radicale.views.index')}
         ]
     return []
+
+
+@events.observe('ExtEnabled')
+def extension_enabled(extension):
+    """ExtEnabled event listener.
+
+    Usefull when *limits* extension is activated after *radicale*.
+
+    :param extension: enabled extension
+
+    """
+    if extension.name == 'limits':
+        from modoboa.extensions.radicale import (
+            init_limits_dependant_features
+        )
+
+        init_limits_dependant_features()