diff --git a/setup.py b/setup.py
index 9b32ec6..adff531 100755
--- a/setup.py
+++ b/setup.py
@@ -5,9 +5,11 @@
 # License, v. 2.0. If a copy of the MPL was not distributed with this file, You
 # can obtain one at http://mozilla.org/MPL/2.0/.
 
-import setuptools
+from setuptools import setup
+from Cython.Build import cythonize
 
-setuptools.setup(
+setup(
     setup_requires=['pbr'],
-    pbr=True
+    pbr=True,
+    ext_modules = cythonize("guidedlda/_guidedlda.pyx")
 )