diff --git a/setup.py b/setup.py
index 32b461d..24db8c0 100644
--- a/setup.py
+++ b/setup.py
@@ -30,6 +30,7 @@ def readme():
         'requests',
         'python-pidfile>=3.0.0',
         'pillow',
+        'python-xlib',
     ],
     entry_points={
         'console_scripts': [