diff --git a/var/spack/repos/builtin/packages/openjdk/package.py b/var/spack/repos/builtin/packages/openjdk/package.py
index 5643c5d8de..3c9442b973 100644
--- a/var/spack/repos/builtin/packages/openjdk/package.py
+++ b/var/spack/repos/builtin/packages/openjdk/package.py
@@ -7,6 +7,7 @@
 import platform
 import re
 
+from spack.util.prefix import Prefix
 
 # If you need to add a new version, please be aware that:
 #  - versions in the following dict are automatically added to the package