diff --git a/plyxproto/model.py b/plyxproto/model.py
index 9cbdccc..e2b0bf8 100644
--- a/plyxproto/model.py
+++ b/plyxproto/model.py
@@ -81,7 +81,7 @@
          visitor.visit_LinkDefinition(self)
 
 class FieldDefinition(SourceElement):
-    def __init__(self, field_modifier, ftype, name, fieldId, fieldDirective, linespan=None, lexspan=None, p=None):
+    def __init__(self, field_modifier, ftype, name, policy, fieldId, fieldDirective, linespan=None, lexspan=None, p=None):
         super(FieldDefinition, self).__init__(linespan=linespan, lexspan=lexspan, p=p)
         self._fields += ['field_modifier', 'ftype', 'name', 'fieldId', 'policy', 'fieldDirective']
         self.name = name
@@ -91,8 +91,8 @@
         self.ftype = ftype
         Base.p(self.ftype, self)
         self.fieldId = fieldId
-        Base.p(self.policy, self)
         self.policy = policy
+        Base.p(self.policy, self)
 
         Base.p(self.fieldId, self)
         self.fieldDirective = fieldDirective