diff --git a/www/conservancy/apps/assignment/forms.py b/www/conservancy/apps/assignment/forms.py
index 288dc75aa54bcfee7bf8e7da40aad497b97e6328..cd93ea3f1eff15f6c3eb7e922688a33a41a70fcf 100644
--- a/www/conservancy/apps/assignment/forms.py
+++ b/www/conservancy/apps/assignment/forms.py
@@ -65,3 +65,5 @@ class AssignmentForm(forms.ModelForm):
 
         if self.cleaned_data['period_end_type'] == 'a specific past date' and not self.cleaned_data['period_ends']:
             raise ValidationError('This field is required')
+
+        return self.cleaned_data['period_ends']