diff --git a/tests/modeltests/model_formsets/models.py b/tests/modeltests/model_formsets/models.py
index cda3aa9d8e..d6f541bfd5 100644
--- a/tests/modeltests/model_formsets/models.py
+++ b/tests/modeltests/model_formsets/models.py
@@ -885,7 +885,7 @@ False
 >>> form = formset.forms[0] # this formset only has one form
 >>> now = form.fields['date_joined'].initial
 >>> print form.as_p()
-<p><label for="id_membership_set-0-date_joined">Date joined:</label> <input type="text" name="membership_set-0-date_joined" value="..." id="id_membership_set-0-date_joined" /><input type="hidden" name="initial-membership_set-0-date_joined" value="..." id="id_membership_set-0-date_joined" /></p>
+<p><label for="id_membership_set-0-date_joined">Date joined:</label> <input type="text" name="membership_set-0-date_joined" value="..." id="id_membership_set-0-date_joined" /><input type="hidden" name="initial-membership_set-0-date_joined" value="..." id="initial-membership_set-0-id_membership_set-0-date_joined" /></p>
 <p><label for="id_membership_set-0-karma">Karma:</label> <input type="text" name="membership_set-0-karma" id="id_membership_set-0-karma" /><input type="hidden" name="membership_set-0-person" value="1" id="id_membership_set-0-person" /><input type="hidden" name="membership_set-0-id" id="id_membership_set-0-id" /></p>
 
 # test for validation with callable defaults. Validations rely on hidden fields