diff --git a/scripts/qapi-types.py b/scripts/qapi-types.py
index 7e35bb6..b37900f 100644
--- a/scripts/qapi-types.py
+++ b/scripts/qapi-types.py
@@ -36,18 +36,18 @@
                  c_name=c_name(name), c_type=element_type.c_type())
 
 
-def gen_struct_field(name, typ, optional):
+def gen_struct_field(member):
     ret = ''
 
-    if optional:
+    if member.optional:
         ret += mcgen('''
     bool has_%(c_name)s;
 ''',
-                     c_name=c_name(name))
+                     c_name=c_name(member.name))
     ret += mcgen('''
     %(c_type)s %(c_name)s;
 ''',
-                 c_type=typ.c_type(), c_name=c_name(name))
+                 c_type=member.type.c_type(), c_name=c_name(member.name))
     return ret
 
 
@@ -60,13 +60,13 @@
 ''',
                      c_name=base.c_name())
         for memb in base.members:
-            ret += gen_struct_field(memb.name, memb.type, memb.optional)
+            ret += gen_struct_field(memb)
         ret += mcgen('''
     /* Own members: */
 ''')
 
     for memb in local_members:
-        ret += gen_struct_field(memb.name, memb.type, memb.optional)
+        ret += gen_struct_field(memb)
     return ret
 
 
@@ -149,9 +149,7 @@
     if base:
         ret += gen_struct_fields([], base)
     else:
-        ret += gen_struct_field(variants.tag_member.name,
-                                variants.tag_member.type,
-                                False)
+        ret += gen_struct_field(variants.tag_member)
 
     # FIXME: What purpose does data serve, besides preventing a union that
     # has a branch named 'data'? We use it in qapi-visit.py to decide