diff --git a/plstackapi/core/models/slice.py b/plstackapi/core/models/slice.py
index fe16402..27184dc 100644
--- a/plstackapi/core/models/slice.py
+++ b/plstackapi/core/models/slice.py
@@ -2,7 +2,7 @@
 from django.db import models
 from plstackapi.core.models import PlCoreBase
 from plstackapi.core.models import Site
-from plstackapi.core.models import User
+from plstackapi.core.models import PLUser
 from plstackapi.core.models import Role
 from plstackapi.core.models import DeploymentNetwork
 from plstackapi.openstack.driver import OpenStackDriver
@@ -54,7 +54,7 @@
         super(Slice, self).delete(*args, **kwds)    
 
 class SliceMembership(PlCoreBase):
-    user = models.ForeignKey('User', related_name='slice_memberships')
+    user = models.ForeignKey('PLUser', related_name='slice_memberships')
     slice = models.ForeignKey('Slice', related_name='slice_memberships')
     role = models.ForeignKey('Role')