diff --git a/setup.py b/setup.py
index b9637bf..74c2d49 100644
--- a/setup.py
+++ b/setup.py
@@ -7,6 +7,7 @@ setup(name='pythonwhois',
       author_email='pythonwhois@cryto.net',
       url='http://cryto.net/pythonwhois',
       packages=['pythonwhois'],
+      install_requires=['argparse'],
       provides=['pythonwhois'],
       scripts=["pwhois"],
       license="WTFPL"