diff --git a/builtin/rebase.c b/builtin/rebase.c
index de400f9a19..7a2e98015c 100644
--- a/builtin/rebase.c
+++ b/builtin/rebase.c
@@ -2119,6 +2119,7 @@ cleanup:
 	free(options.head_name);
 	free(options.gpg_sign_opt);
 	free(options.cmd);
+	strbuf_release(&options.git_format_patch_opt);
 	free(squash_onto_name);
 	return ret;
 }