diff --git a/repos/os/include/vfs/directory_service.h b/repos/os/include/vfs/directory_service.h
index 7abbb38fdb..a891eb89ae 100644
--- a/repos/os/include/vfs/directory_service.h
+++ b/repos/os/include/vfs/directory_service.h
@@ -41,7 +41,7 @@ struct Vfs::Directory_service : Interface
 	/**
 	 * Flags of 'mode' argument of open syscall
 	 */
-	enum {
+	enum Open_mode {
 		OPEN_MODE_RDONLY  = 0,
 		OPEN_MODE_WRONLY  = 1,
 		OPEN_MODE_RDWR    = 2,