diff --git a/setup.py b/setup.py
index a85c9e3fcdbf7..9b821868801ec 100644
--- a/setup.py
+++ b/setup.py
@@ -141,6 +141,7 @@ def py2exe_options():
         'html2text',
         'Jinja2',
         'lxml',  # windows binary http://www.lfd.uci.edu/~gohlke/pythonlibs/
+        'libsass',
         'mako',
         'mock',
         'ofxparse',