diff --git a/lib/spack/spack/build_systems/python.py b/lib/spack/spack/build_systems/python.py
index c6293847b44..01e8265aff7 100644
--- a/lib/spack/spack/build_systems/python.py
+++ b/lib/spack/spack/build_systems/python.py
@@ -17,8 +17,8 @@
 import llnl.util.tty as tty
 from llnl.util.filesystem import HeaderList, LibraryList, join_path
 
-import spack.builder
 import spack.build_environment
+import spack.builder
 import spack.config
 import spack.context
 import spack.deptypes as dt