diff --git a/var/spack/repos/builtin/packages/libtool/package.py b/var/spack/repos/builtin/packages/libtool/package.py
index 05db3c07c94..0e410a50614 100644
--- a/var/spack/repos/builtin/packages/libtool/package.py
+++ b/var/spack/repos/builtin/packages/libtool/package.py
@@ -24,6 +24,7 @@
 ##############################################################################
 from spack import *
 
+
 class Libtool(Package):
     """
     libtool -- library building part of autotools