diff --git a/Products/CMFDiffTool/dexteritydiff.py b/Products/CMFDiffTool/dexteritydiff.py
index 1362499..b65fe63 100644
--- a/Products/CMFDiffTool/dexteritydiff.py
+++ b/Products/CMFDiffTool/dexteritydiff.py
@@ -57,7 +57,7 @@
 """
 
 # TODO: provide an easier way to exclude fields.
-EXCLUDED_FIELDS = ('modification_date', 'changeNote')
+EXCLUDED_FIELDS = ('modification_date', 'IVersionable.changeNote')
 """Names of fields not to compare."""