diff --git a/lib/spack/spack/stage.py b/lib/spack/spack/stage.py
index 6cf736b3f0f..8f3f0e163a0 100644
--- a/lib/spack/spack/stage.py
+++ b/lib/spack/spack/stage.py
@@ -308,7 +308,7 @@ def fetch(self, mirror_only=False):
             archive_version = spack.url.parse_version(self.default_fetcher.url)
             package_name = os.path.dirname(self.mirror_path)
             pkg = spack.repo.get(package_name)
-            if pkg.list_url is not None:
+            if pkg.list_url is not None and pkg.url is not None:
                 versions = pkg.fetch_remote_versions()
                 try:
                     url_from_list = versions[Version(archive_version)]