diff --git a/mayan/apps/acls/views.py b/mayan/apps/acls/views.py
index cce6cbefba..cacbca3e17 100644
--- a/mayan/apps/acls/views.py
+++ b/mayan/apps/acls/views.py
@@ -13,7 +13,7 @@ from common.views import (
     AssignRemoveView, SingleObjectCreateView, SingleObjectDeleteView,
     SingleObjectListView
 )
-from permissions import PermissionNamespace
+from permissions import PermissionNamespace, Permission
 from permissions.models import StoredPermission
 
 from .classes import ModelPermission
@@ -228,6 +228,7 @@ class ACLPermissionsView(AssignRemoveView):
         return None
 
     def left_list(self):
+        Permission.refresh()
         return ACLPermissionsView.generate_choices(self.get_available_list())
 
     def remove(self, item):
diff --git a/mayan/apps/permissions/classes.py b/mayan/apps/permissions/classes.py
index 8bcd8030d4..2eb6031dec 100644
--- a/mayan/apps/permissions/classes.py
+++ b/mayan/apps/permissions/classes.py
@@ -45,12 +45,15 @@ class PermissionNamespace(object):
 
 
 class Permission(object):
-    _stored_permissions_cache = {}
     _permissions = {}
+    _stored_permissions_cache = {}
 
     @classmethod
-    def invalidate_cache(cls):
-        cls._stored_permissions_cache = {}
+    def all(cls):
+        # Return sorted permisions by namespace.name
+        return sorted(
+            cls._permissions.values(), key=lambda x: x.namespace.name
+        )
 
     @classmethod
     def check_permissions(cls, requester, permissions):
@@ -67,6 +70,13 @@ class Permission(object):
 
         raise PermissionDenied(_('Insufficient permissions.'))
 
+    @classmethod
+    def get(cls, pk, proxy_only=False):
+        if proxy_only:
+            return cls._permissions[pk]
+        else:
+            return cls._permissions[pk].stored_permission
+
     @classmethod
     def get_for_holder(cls, holder):
         StoredPermission = apps.get_model(
@@ -76,19 +86,13 @@ class Permission(object):
         return StoredPermission.get_for_holder(holder)
 
     @classmethod
-    def all(cls):
-        # Return sorted permisions by namespace.name
-        return sorted(
-            cls._permissions.values(), key=lambda x: x.namespace.name
-        )
+    def invalidate_cache(cls):
+        cls._stored_permissions_cache = {}
 
     @classmethod
-    def get(cls, get_dict, proxy_only=False):
-        if 'pk' in get_dict:
-            if proxy_only:
-                return cls._permissions[get_dict['pk']]
-            else:
-                return cls._permissions[get_dict['pk']].stored_permission
+    def refresh(cls):
+        for permission in cls.all():
+            permission.stored_permission
 
     def __init__(self, namespace, name, label):
         self.namespace = namespace
@@ -97,16 +101,15 @@ class Permission(object):
         self.pk = self.uuid
         self.__class__._permissions[self.uuid] = self
 
+    def __repr__(self):
+        return self.pk
+
     def __unicode__(self):
         return unicode(self.label)
 
     def __str__(self):
         return str(self.__unicode__())
 
-    @property
-    def uuid(self):
-        return '%s.%s' % (self.namespace.name, self.name)
-
     @property
     def stored_permission(self):
         StoredPermission = apps.get_model(
@@ -125,3 +128,7 @@ class Permission(object):
                 self.uuid
             ] = stored_permission
             return stored_permission
+
+    @property
+    def uuid(self):
+        return '%s.%s' % (self.namespace.name, self.name)
diff --git a/mayan/apps/permissions/management/commands/purgepermissions.py b/mayan/apps/permissions/management/commands/purgepermissions.py
index 23d36bb3be..7c5dd04270 100644
--- a/mayan/apps/permissions/management/commands/purgepermissions.py
+++ b/mayan/apps/permissions/management/commands/purgepermissions.py
@@ -13,7 +13,7 @@ class Command(BaseCommand):
         for permission in StoredPermission.objects.all():
             try:
                 Permission.get(
-                    {'pk': '%s.%s' % (permission.namespace, permission.name)},
+                    pk='{}.{}'.format(permission.namespace, permission.name),
                     proxy_only=True
                 )
             except KeyError:
diff --git a/mayan/apps/permissions/models.py b/mayan/apps/permissions/models.py
index 35b55cf0b9..a2154964e8 100644
--- a/mayan/apps/permissions/models.py
+++ b/mayan/apps/permissions/models.py
@@ -26,7 +26,7 @@ class StoredPermission(models.Model):
         super(StoredPermission, self).__init__(*args, **kwargs)
         try:
             self.volatile_permission = Permission.get(
-                {'pk': '%s.%s' % (self.namespace, self.name)},
+                pk='{}.{}'.format(self.namespace, self.name),
                 proxy_only=True
             )
         except KeyError:
diff --git a/mayan/apps/permissions/serializers.py b/mayan/apps/permissions/serializers.py
index e660e922ba..3fb547d329 100644
--- a/mayan/apps/permissions/serializers.py
+++ b/mayan/apps/permissions/serializers.py
@@ -63,8 +63,7 @@ class RoleNewPermissionSerializer(serializers.Serializer):
 
         try:
             for pk in validated_data['permission_pk_list'].split(','):
-                get_dict = {'pk': pk}
-                stored_permission = Permission.get(get_dict=get_dict)
+                stored_permission = Permission.get(pk=pk)
 
                 validated_data['role'].permissions.add(stored_permission)
         except KeyError as exception:
diff --git a/mayan/apps/permissions/views.py b/mayan/apps/permissions/views.py
index 80ebf9ac82..f04eaf82b0 100644
--- a/mayan/apps/permissions/views.py
+++ b/mayan/apps/permissions/views.py
@@ -97,7 +97,9 @@ class SetupRolePermissionsView(AssignRemoveView):
         return get_object_or_404(Role, pk=self.kwargs['pk'])
 
     def left_list(self):
+        Permission.refresh()
         results = []
+
         for namespace, permissions in itertools.groupby(StoredPermission.objects.exclude(id__in=self.get_object().permissions.values_list('pk', flat=True)), lambda entry: entry.namespace):
             permission_options = [
                 (unicode(permission.pk), permission) for permission in permissions