diff --git a/rowers/serializers.py b/rowers/serializers.py
index 25fdc7f2..31ba133c 100644
--- a/rowers/serializers.py
+++ b/rowers/serializers.py
@@ -13,6 +13,8 @@ from rowers.models import (
     GeoCourse, GeoPolygon, GeoPoint,
     )
 
+from django.core.exceptions import PermissionDenied
+
 import datetime
 
 # Serializers define the API representation.