diff --git a/mode_xml.py b/mode_xml.py
index 9a37ea3..c54d502 100644
--- a/mode_xml.py
+++ b/mode_xml.py
@@ -1,5 +1,5 @@
 import color, mode2
-from lex2 import Grammar, ConstantRule, PatternRule, RegionRule, DualRegionRule
+from lex2 import Grammar, PatternRule, RegionRule
 
 class TagGrammar(Grammar):
     rules = [