diff --git a/setup.cfg b/setup.cfg
index ad81baa62..289e449d3 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -18,4 +18,4 @@ frameworks = CoreFoundation, Foundation, AppKit
 known_standard_library=unicodedata
 line_length=120
 skip=gtkui.py
-known_third_party=pygtk, gtk, gobject, gtk.gdk, pango, cairo, pangocairo
+known_third_party=pygtk,gtk,gobject,gtk.gdk,pango,cairo,pangocairo