diff --git a/lib/spack/spack/test/modules.py b/lib/spack/spack/test/modules.py
index b6d35154e33..135cd028e3d 100644
--- a/lib/spack/spack/test/modules.py
+++ b/lib/spack/spack/test/modules.py
@@ -27,7 +27,6 @@
 
 import StringIO
 import spack.modules
-import unittest
 from spack.test.mock_packages_test import MockPackagesTest
 
 FILE_REGISTRY = collections.defaultdict(StringIO.StringIO)