diff --git a/www/conservancy/apps/assignment/urls.py b/www/conservancy/apps/assignment/urls.py
index 1be0b775d6fc05761d5772c3c0eef5e5a4bf513d..0502b0ef4de5807ec9315c94d30877f1c17fbdab 100644
--- a/www/conservancy/apps/assignment/urls.py
+++ b/www/conservancy/apps/assignment/urls.py
@@ -5,5 +5,5 @@ from .views import AssignmentCreateView, AssignmentThanksView
 
 urlpatterns = [
     url(r'^$', AssignmentCreateView.as_view(), name='assignement-add'),
-    url(r'^thanks/$', AssignmentThanksView.as_view(), name='assignment-thanks'),
+    url(r'^(?P<pk>[\w-]+)/$', AssignmentThanksView.as_view(), name='assignment-thanks'),
 ]