--- a/urltree.py	Thu Feb 12 01:38:29 2009 +0200
+++ b/urltree.py	Thu Feb 12 01:53:21 2009 +0200
@@ -685,7 +685,7 @@
         # build query args as { key -> [value] }
         query_args = dict((key, type.build_multi(values[key])) for key, (type, default) in self.query_args.iteritems() if key in values and values[key] is not None)
 
-        return "%s%s" % (url, '?%s' % ('&'.join('%s=%s' % (key, value) for value in values for key, values in query_args.iteritems())) if query_args else '')
+        return "%s%s" % (url, '?%s' % ('&'.join('%s=%s' % (key, value) for key, values in query_args.iteritems() for value in values)) if query_args else '')
 
     def __str__ (self) :
         return '/'.join(str(label) for label in self.label_path)