diff --git a/setup.py b/setup.py
index cc736a6..1512bf5 100644
--- a/setup.py
+++ b/setup.py
@@ -30,6 +30,7 @@ setup(name             = 'pytimeparse',
       author_email     = 'wildwilhelm@gmail.com',
       url              = 'https://github.com/wroberts/pytimeparse',
       packages         = ['pytimeparse'],
+      install_requires = ['future'],
       license          = 'MIT',
       install_requires = INSTALL_REQUIRES,
       long_description = LONG_DESCRIPTION,