diff --git a/mongoengine/base.py b/mongoengine/base.py
index a7eb17b5..1e1a0212 100644
--- a/mongoengine/base.py
+++ b/mongoengine/base.py
@@ -912,7 +912,7 @@ class BaseDocument(object):
             # We only want named arguments.
             field = iter(self._fields_ordered)
             for value in args:
-                name = next(field)
+                name = field.next()
                 if name in values:
                     raise TypeError("Multiple values for keyword argument '" + name + "'")
                 values[name] = value