diff --git a/app/controllers/api/v1/participant_declarations_controller.rb b/app/controllers/api/v1/participant_declarations_controller.rb
index 93817b4eff..b1347569ea 100644
--- a/app/controllers/api/v1/participant_declarations_controller.rb
+++ b/app/controllers/api/v1/participant_declarations_controller.rb
@@ -71,7 +71,7 @@ def participant_declaration_query_scope
       end
 
       def participant_declaration_for_lead_provider
-        @participant_declaration_for_lead_provider ||= ParticipantDeclaration.for_lead_provider(cpd_lead_provider).find(params[:id])
+        @participant_declaration_for_lead_provider ||= ParticipantDeclaration::ECF.for_lead_provider(cpd_lead_provider).find(params[:id])
       end
 
       def permitted_params
diff --git a/app/controllers/api/v3/participant_declarations_controller.rb b/app/controllers/api/v3/participant_declarations_controller.rb
index f9a6f5f2d7..807cff3bcb 100644
--- a/app/controllers/api/v3/participant_declarations_controller.rb
+++ b/app/controllers/api/v3/participant_declarations_controller.rb
@@ -99,7 +99,7 @@ def participant_declaration_from_query
       end
 
       def participant_declaration_for_lead_provider
-        @participant_declaration_for_lead_provider ||= ParticipantDeclaration.for_lead_provider(cpd_lead_provider).find(params[:id])
+        @participant_declaration_for_lead_provider ||= ParticipantDeclaration::ECF.for_lead_provider(cpd_lead_provider).find(params[:id])
       end
 
       def serializer_class