diff --git a/LibGit2Sharp/Core/GitOdbBackend.cs b/LibGit2Sharp/Core/GitOdbBackend.cs
index 0d68a3433..3ff031048 100644
--- a/LibGit2Sharp/Core/GitOdbBackend.cs
+++ b/LibGit2Sharp/Core/GitOdbBackend.cs
@@ -33,6 +33,9 @@ static GitOdbBackend()
         public exists_prefix_callback ExistsPrefix;
         public IntPtr Refresh;
         public foreach_callback Foreach;
+
+        private IntPtr Padding; // TODO: add writemidx
+
         public IntPtr Writepack;
         public IntPtr Freshen;
         public free_callback Free;