diff --git a/src/system/kernel/slab/HashedObjectCache.h b/src/system/kernel/slab/HashedObjectCache.h
index b82d4f7789..08e1e51302 100644
--- a/src/system/kernel/slab/HashedObjectCache.h
+++ b/src/system/kernel/slab/HashedObjectCache.h
@@ -81,6 +81,8 @@ private:
 
 			typedef BOpenHashTable<Definition> HashTable;
 
+			friend class Definition;
+
 private:
 	static	Link*				_AllocateLink(uint32 flags);
 	static	void				_FreeLink(HashedObjectCache::Link* link);