diff --git a/lib/verdict/experiment.rb b/lib/verdict/experiment.rb
index b4e9482..2df0ee8 100644
--- a/lib/verdict/experiment.rb
+++ b/lib/verdict/experiment.rb
@@ -274,7 +274,7 @@ def ensure_experiment_has_started
   end
 
   def nil_assignment(subject)
-    subject_assignment(subject, nil, nil)
+    Verdict::Assignment.new(self, subject, nil, nil)
   end
 
   private