diff --git a/esprima/character.py b/esprima/character.py
index 929706c..25b87d2 100644
--- a/esprima/character.py
+++ b/esprima/character.py
@@ -82,7 +82,6 @@
 
 del U_CATEGORIES, UNICODE_LETTER, UNICODE_COMBINING_MARK
 del UNICODE_DIGIT, UNICODE_CONNECTOR_PUNCTUATION
-del DECIMAL_CONV, OCTAL_CONV, HEX_CONV
 
 class Character:
     @staticmethod