diff --git a/src/sugar/graphics/palette.py b/src/sugar/graphics/palette.py
index 12774770..79f5e86b 100644
--- a/src/sugar/graphics/palette.py
+++ b/src/sugar/graphics/palette.py
@@ -246,6 +246,7 @@ class Palette(gtk.Window):
         self._palette_popup_sid = None
         self._enter_invoker_hid = None
         self._leave_invoker_hid = None
+        self._right_click_invoker_hid = None
 
         # we set these for backward compatibility
         if label is not None: