diff --git a/include/nn/fs/fs_save.h b/include/nn/fs/fs_save.h
index 8fd1142..03a9b15 100644
--- a/include/nn/fs/fs_save.h
+++ b/include/nn/fs/fs_save.h
@@ -3,10 +3,16 @@
 #include <nn/account.h>
 #include <nn/fs/fs_types.h>
 
+namespace nn {
+typedef u64 ApplicationId;
+};
+
 namespace nn::fs {
 
 Result EnsureSaveData(const nn::account::Uid&);
 Result MountSaveData(const char*, UserId);
+Result MountSaveData(const char*, const nn::account::Uid&);
+Result MountSaveData(const char*, ApplicationId, const nn::account::Uid&);
 Result MountSaveDataForDebug(const char*);
 Result CommitSaveData(const char* path);