diff --git a/Tools/pynche/TypeinViewer.py b/Tools/pynche/TypeinViewer.py
index d25eb827a9c..44c4b3629ae 100644
--- a/Tools/pynche/TypeinViewer.py
+++ b/Tools/pynche/TypeinViewer.py
@@ -93,7 +93,7 @@ class TypeinWidget(Pmw.MegaWidget):
     def __modified(self):
 	# these are guaranteed to be valid, right?
 	vals = map(lambda x: x.get(), (self.__x, self.__y, self.__z))
-	rgbs = map(self.__str_to_int, vals)
+	rgbs = tuple(map(self.__str_to_int, vals))
 	valids = map(self.__validate, vals)
 	delegate = self['delegate']
 	if (None not in rgbs) and (-1 not in valids) and delegate: