diff --git a/webapp/tests/signup_fixture.py b/webapp/tests/signup_fixture.py
index b55a43c..dc3078c 100644
--- a/webapp/tests/signup_fixture.py
+++ b/webapp/tests/signup_fixture.py
@@ -26,6 +26,6 @@ def createSignupObject(form, answer):
 
 def createSignupJSON(form_id, answer):
     return {
-        "signupForm": form_id,
+        "signupForm_id": form_id,
         "answer": answer
     }