thodg/libgit2

diff --git a/src/mwindow.c b/src/mwindow.c
index 1d64d26..0444cd9 100644
--- a/src/mwindow.c
+++ b/src/mwindow.c
@@ -41,6 +41,8 @@ int git_mwindow_files_init(void)
 	if (git__pack_cache)
 		return 0;
 
+	git__on_shutdown(git_mwindow_files_free);
+
 	return git_strmap_alloc(&git__pack_cache);
 }