diff --git a/var/spack/repos/builtin/packages/mpich/package.py b/var/spack/repos/builtin/packages/mpich/package.py
index b72f322a00..581f4d0d31 100644
--- a/var/spack/repos/builtin/packages/mpich/package.py
+++ b/var/spack/repos/builtin/packages/mpich/package.py
@@ -7,6 +7,7 @@
 import re
 import sys
 
+from spack.build_environment import dso_suffix
 from spack.package import *