diff --git a/setup.py b/setup.py
index 88c27c95118..68798bdf219 100644
--- a/setup.py
+++ b/setup.py
@@ -69,5 +69,6 @@
       install_requires=INSTALL_REQUIRES,
       tests_require=TESTS_REQUIRE,
       url=URL,
+      python_requires='>=2.7,!=3.0.*,!=3.1.*,!=3.2.*,!=3.3.*,!=3.4.*',
       packages=find_packages(),
       package_data={'xarray': ['tests/data/*']})