diff --git a/repository/SmalltalkCI-Pharo-Core.package/SmalltalkCIPharo12.class/class/classesInCategory..st b/repository/SmalltalkCI-Pharo-Core.package/SmalltalkCIPharo12.class/class/classesInCategory..st
index f220e0ee..187e2648 100644
--- a/repository/SmalltalkCI-Pharo-Core.package/SmalltalkCIPharo12.class/class/classesInCategory..st
+++ b/repository/SmalltalkCI-Pharo-Core.package/SmalltalkCIPharo12.class/class/classesInCategory..st
@@ -1,6 +1,5 @@
 class organization
 classesInCategory: aCategory
-	^ (Smalltalk organization tagForCategory: aCategory)
-		ifNotNil: [ :tag |
-			tag classNames collect: [ :className | Smalltalk at: className ] ]
+	^ (Smalltalk organization packageMatchingExtensionName: aCategory)
+		ifNotNil: [ :package | package definedClasses ]
 		ifNil: [ #() ]