diff --git a/app/models/form/sales/pages/person_sex_registered_at_birth.rb b/app/models/form/sales/pages/person_sex_registered_at_birth.rb
index b85fa0659..495513766 100644
--- a/app/models/form/sales/pages/person_sex_registered_at_birth.rb
+++ b/app/models/form/sales/pages/person_sex_registered_at_birth.rb
@@ -3,7 +3,7 @@
 class Form::Sales::Pages::PersonSexRegisteredAtBirth < ::Form::Page
   def initialize(id, hsh, subsection, person_index:)
     super(id, hsh, subsection)
-    @copy_key = "sales.household_characteristics.sex2.person" if person_index == 2
+    @copy_key = "sales.household_characteristics.sexRAB2.person" if person_index == 2
     @person_index = person_index
     @depends_on = [
       { "details_known_#{person_index}" => 1 },