diff --git a/src/add-ons/kernel/file_systems/bfs/Index.h b/src/add-ons/kernel/file_systems/bfs/Index.h
index 8d8ba070d5..ae63dfbb03 100644
--- a/src/add-ons/kernel/file_systems/bfs/Index.h
+++ b/src/add-ons/kernel/file_systems/bfs/Index.h
@@ -51,7 +51,7 @@ public:
 			status_t		RemoveLastModified(Transaction& transaction,
 								Inode* inode);
 			status_t		UpdateLastModified(Transaction& transaction,
-								Inode* inode, off_t modified = -1);
+								Inode* inode, bigtime_t modified = -1);
 
 private:
 							Index(const Index& other);