diff --git a/src/python/OBis/setup.py b/src/python/OBis/setup.py
index b7ab75636d3c3f6cd2260de601d4978494b47be0..ae1e49f85002ef86fc52fe4adbb5710eb8fb6c0c 100644
--- a/src/python/OBis/setup.py
+++ b/src/python/OBis/setup.py
@@ -12,6 +12,7 @@ setup(name='obis',
       packages=['obis', 'obis.dm', 'obis.dm.commands', 'obis.scripts'],
       package_data={'obis' : ['dm/git-annex-attributes']},
       install_requires=[
+          'pyOpenSSL',
           'pytest',
           'pybis',
           'click'