diff --git a/fs_mgr/libsnapshot/include/libsnapshot/cow_format.h b/fs_mgr/libsnapshot/include/libsnapshot/cow_format.h
index 797b8ef..e93254e 100644
--- a/fs_mgr/libsnapshot/include/libsnapshot/cow_format.h
+++ b/fs_mgr/libsnapshot/include/libsnapshot/cow_format.h
@@ -24,6 +24,8 @@
 static constexpr uint32_t kCowVersionMajor = 1;
 static constexpr uint32_t kCowVersionMinor = 0;
 
+static constexpr uint32_t kCowVersionManifest = 1;
+
 // This header appears as the first sequence of bytes in the COW. All fields
 // in the layout are little-endian encoded. The on-disk layout is:
 //