diff --git a/interfaces/cython/setup.py.in b/interfaces/cython/setup.py.in
index b6a4e421b..9e60cee50 100644
--- a/interfaces/cython/setup.py.in
+++ b/interfaces/cython/setup.py.in
@@ -83,6 +83,7 @@ setup(
         'Programming Language :: Python :: 2.7',
         'Programming Language :: Python :: 3.3',
         'Programming Language :: Python :: 3.4',
+        'Programming Language :: Python :: 3.5',
         'Topic :: Scientific/Engineering :: Chemistry',
     ],
     package_data = {