diff --git a/src/add-ons/kernel/file_systems/userlandfs/kernel_add_on/FileSystem.h b/src/add-ons/kernel/file_systems/userlandfs/kernel_add_on/FileSystem.h
index de50f83b91..873dc550c0 100644
--- a/src/add-ons/kernel/file_systems/userlandfs/kernel_add_on/FileSystem.h
+++ b/src/add-ons/kernel/file_systems/userlandfs/kernel_add_on/FileSystem.h
@@ -107,12 +107,14 @@ public:
 			bool				IsUserlandServerThread() const;
 
 private:
-			friend class KernelDebug;
 			struct SelectSyncMap;
 			struct NodeListenerKey;
 			struct NodeListenerProxy;
 			struct NodeListenerHashDefinition;
 
+			friend class KernelDebug;
+			friend struct NodeListenerProxy;
+
 			typedef BOpenHashTable<VNodeOpsHashDefinition> VNodeOpsMap;
 			typedef BOpenHashTable<NodeListenerHashDefinition> NodeListenerMap;