diff --git a/lib/saxy/element.rb b/lib/saxy/element.rb
index dd94799..46fecea 100644
--- a/lib/saxy/element.rb
+++ b/lib/saxy/element.rb
@@ -38,8 +38,8 @@ def attribute_name(name)
 
     def underscore(word)
       word = word.dup
-      word.gsub!(/([A-Z\d]+)([A-Z][a-z])/,'\1_\2')
-      word.gsub!(/([a-z\d])([A-Z])/,'\1_\2')
+      word.gsub!(/([A-Z\d]+)([A-Z][a-z])/, '\1_\2')
+      word.gsub!(/([a-z\d])([A-Z])/, '\1_\2')
       word.tr!("-", "_")
       word.downcase!
       word