diff --git a/source/TCAP-Core/TCAPModelRoot.class.st b/source/TCAP-Core/TCAPModelRoot.class.st
index 4afad39..35ed47a 100644
--- a/source/TCAP-Core/TCAPModelRoot.class.st
+++ b/source/TCAP-Core/TCAPModelRoot.class.st
@@ -68,7 +68,7 @@ TCAPModelRoot >> configureModel [
 	| col |
 	col := OrderedCollection new.
 	{ 'TCAP-Core' . 'ROS-Core' } do: [ :name | 
-		(((RPackage organizer packageNamed: name) classes 
+		(((PackageOrganizer default packageNamed: name) classes 
 			select: [ :each | each inheritsFrom: ASN1BasicObject ])
 			select: [ :each | each isAsn1ModelClass ]) collect: [ :cls |
 				col add: (cls asn1TypeName -> cls asn1InstanceFactory) ] ].