diff --git a/lib/spack/spack/package.py b/lib/spack/spack/package.py
index bf406ed742cd4e..99dfa0be1ca69a 100644
--- a/lib/spack/spack/package.py
+++ b/lib/spack/spack/package.py
@@ -62,10 +62,6 @@
 from spack.package_prefs import get_package_dir_permissions, get_package_group
 
 
-"""Allowed URL schemes for spack packages."""
-_ALLOWED_URL_SCHEMES = ["http", "https", "ftp", "file", "git"]
-
-
 class InstallPhase(object):
     """Manages a single phase of the installation.