diff --git a/var/spack/repos/builtin/packages/py-xopen/package.py b/var/spack/repos/builtin/packages/py-xopen/package.py
index d0d112892dd..8fda2246337 100644
--- a/var/spack/repos/builtin/packages/py-xopen/package.py
+++ b/var/spack/repos/builtin/packages/py-xopen/package.py
@@ -20,4 +20,6 @@ class PyXopen(PythonPackage):
     version('0.1.1', '4e0e955546ee6bee4ea736b54623a671')
 
     depends_on('py-setuptools', type='build')
-    depends_on('python@2.6:', type=('build', 'run'))
+    depends_on('py-bz2file', type=('build','run'), when='@0.5:')
+    depends_on('python@2.7,3.4:', type=('build', 'run'), when='@0.5:')
+    depends_on('python@2.6:2.99,3.3:', type=('build', 'run'), when='@0.1.1')