diff --git a/xos/models.py b/xos/models.py
index f537adc..8fc5fc3 100755
--- a/xos/models.py
+++ b/xos/models.py
@@ -12,8 +12,9 @@
 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 # See the License for the specific language governing permissions and
 # limitations under the License.
+from header import *
 
-from core.models import Tenant
+from core.models import Tenant, XOSBase
 
 
 class EnterpriseLocation(Tenant):