diff --git a/lib/spack/spack/platforms/cray.py b/lib/spack/spack/platforms/cray.py
index 2883a35ec7b..2bd2a404634 100644
--- a/lib/spack/spack/platforms/cray.py
+++ b/lib/spack/spack/platforms/cray.py
@@ -27,9 +27,9 @@ def _target_from_clean_env(name):
         # CAUTION - $USER is generally needed to initialize the environment.
         # There may be other variables needed for general success.
         output = env('USER=%s' % os.environ['USER'],
-                    '/bin/bash', '--noprofile', '--norc', '-c',
-                    '. /etc/profile; module list -lt',
-                    output=str, error=str)
+                     '/bin/bash', '--noprofile', '--norc', '-c',
+                     '. /etc/profile; module list -lt',
+                     output=str, error=str)
         default_modules = [i for i in output.splitlines()
                            if len(i.split()) == 1]
         tty.debug("Found default modules:",