--- a/req.py	Fri Mar 12 14:51:59 2010 +0100
+++ b/req.py	Fri Mar 12 14:52:22 2010 +0100
@@ -231,7 +231,7 @@
     def build_url_params(self, **kwargs):
         """return encoded params to incorporate them in an URL"""
         args = []
-        for param, values in kwargs.items():
+        for param, values in kwargs.iteritems():
             if not isinstance(values, (list, tuple)):
                 values = (values,)
             for value in values: