diff --git a/repos/os/include/vfs/directory_service.h b/repos/os/include/vfs/directory_service.h
index 06dc192508..5c2b69bc15 100644
--- a/repos/os/include/vfs/directory_service.h
+++ b/repos/os/include/vfs/directory_service.h
@@ -188,6 +188,13 @@ struct Vfs::Directory_service
 	virtual bool directory(char const *path) = 0;
 
 	virtual char const *leaf_path(char const *path) = 0;
+
+	/**
+	 * Synchronize file system
+	 *
+	 * This method flushes any delayed operations from the file system.
+	 */
+	virtual void sync(char const *path) { }
 };
 
 #endif /* _INCLUDE__VFS__DIRECTORY_SERVICE_H_ */
diff --git a/repos/os/include/vfs/file_system.h b/repos/os/include/vfs/file_system.h
index 28d3616f05..5925ceae2f 100644
--- a/repos/os/include/vfs/file_system.h
+++ b/repos/os/include/vfs/file_system.h
@@ -29,13 +29,6 @@ struct Vfs::File_system : Directory_service, File_io_service
 
 	File_system() : next(0) { }
 
-	/**
-	 * Synchronize file system
-	 *
-	 * This method flushes any delayed operations from the file system.
-	 */
-	virtual void sync(char const *path) { }
-
 	/**
 	 * Adjust to configuration changes
 	 */