diff --git a/setup.py b/setup.py
index ccd1f653..605349f0 100644
--- a/setup.py
+++ b/setup.py
@@ -61,6 +61,7 @@ setup(
         'ConfigObj',
         'Markdown',
         'python-cloudfiles',
+        'pygtk',
         ## For now we're expecting that users will install this from
         ## their package managers.
         # 'lxml',