diff --git a/builtin/submodule--helper.c b/builtin/submodule--helper.c
index e8ccddd3b1b4473a23a5b50434a140f526f5ca7a..676cfed770f3cce91b4f5eebcb88d17b7f2056b2 100644
--- a/builtin/submodule--helper.c
+++ b/builtin/submodule--helper.c
@@ -510,6 +510,7 @@ static int clone_submodule(const char *path, const char *gitdir, const char *url
 	if (gitdir && *gitdir)
 		argv_array_pushl(&cp.args, "--separate-git-dir", gitdir, NULL);
 
+	argv_array_push(&cp.args, "--");
 	argv_array_push(&cp.args, url);
 	argv_array_push(&cp.args, path);