diff --git i/libgit2-glib/ggit-config.c w/libgit2-glib/ggit-config.c
index b6536ce..2785574 100644
--- i/libgit2-glib/ggit-config.c
+++ w/libgit2-glib/ggit-config.c
@@ -295,6 +295,7 @@ ggit_config_add_file (GgitConfig      *config,
 	ret = git_config_add_file_ondisk (_ggit_native_get (config),
 	                                  path,
 	                                  (git_config_level_t)level,
+	                                  NULL,
 	                                  force);
 	g_free (path);