diff --git a/setup.py b/setup.py
index 53476441c0aabf0fb0dd7b655757f5f666b19e35..516a66f77ead11f9602181bf6ae6d7ec6f3b52ed 100644
--- a/setup.py
+++ b/setup.py
@@ -25,6 +25,7 @@ setup(name='ESS Python Tools',
         'Programming Language :: Python :: 2',
         'Programming Language :: Python :: 2.6',
         'Programming Language :: Python :: 2.7',
+        'Programming Language :: Python :: 3.5',
     ],
     packages=['ess'],
     scripts=['scripts/tracewin', 'scripts/tracewin_errorstudy'],