diff --git a/lib/dehumanize.rb b/lib/dehumanize.rb
index becdca7..faa520f 100644
--- a/lib/dehumanize.rb
+++ b/lib/dehumanize.rb
@@ -1,6 +1,6 @@
 module ActiveSupport::Inflector
-  def dehumanize(the_string)
-    the_string.gsub(' ', '_').downcase
+  def dehumanize(string)
+    string.parameterize.underscore
   end
 end
 
@@ -8,4 +8,4 @@ class String
   def dehumanize
     ActiveSupport::Inflector.dehumanize(self)
   end
-end
\ No newline at end of file
+end