diff --git a/golem_activity_registration_payment/models/__init__.py b/golem_activity_registration_payment/models/__init__.py
index 461a002..8a33eed 100644
--- a/golem_activity_registration_payment/models/__init__.py
+++ b/golem_activity_registration_payment/models/__init__.py
@@ -15,4 +15,4 @@
 #    You should have received a copy of the GNU Affero General Public License
 #    along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
-from . import golem_member, golem_activity_registration
+from . import golem_member, golem_activity_registration, golem_activity