diff --git a/lib/tripit.rb b/lib/tripit.rb
index 8dcd036..07bbb5c 100755
--- a/lib/tripit.rb
+++ b/lib/tripit.rb
@@ -182,8 +182,8 @@ def self.new(element)
         element.elements.each do |e|
             if /^[A-Z]/.match(e.name)
                 name = e.name.intern
-                klass = if TripIt.const_defined?(name)
-                    TripIt.const_get(name)
+                klass = if TripIt.const_defined?(name,false)
+                    TripIt.const_get(name,false)
                 else
                     TripIt.const_set(name, Class.new(TravelObj))
                 end