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-rw-r--r--lib/rexml/parsers/treeparser.rb1
1 files changed, 1 insertions, 0 deletions
diff --git a/lib/rexml/parsers/treeparser.rb b/lib/rexml/parsers/treeparser.rb
index ff8261cedf..5c3e142ea7 100644
--- a/lib/rexml/parsers/treeparser.rb
+++ b/lib/rexml/parsers/treeparser.rb
@@ -1,4 +1,5 @@
require 'rexml/validation/validationexception'
+require 'rexml/undefinednamespaceexception'
module REXML
module Parsers