diff --git a/setup.py b/setup.py
index d445a9e..92e79dc 100644
--- a/setup.py
+++ b/setup.py
@@ -7,6 +7,9 @@
       author = 'Syrus Akbary',
       author_email = 'me@syrusakbary.com',
       description = 'validate_email verifies if an email address is valid and really exists.',
+      install_requires=[
+            "pyDNS",
+      ],
       long_description=open('README.rst').read(),
       keywords = 'email validation verification mx verify',
       url = 'http://github.com/syrusakbary/validate_email',