loci: support special length member in OF 1.4 queue_desc
diff --git a/c_gen/codegen.py b/c_gen/codegen.py
index dba3d53..f480453 100644
--- a/c_gen/codegen.py
+++ b/c_gen/codegen.py
@@ -201,6 +201,7 @@
 special_length_classes = set([
     'of_packet_queue', 'of_meter_stats', 'of_port_desc',
     'of_port_stats_entry', 'of_queue_stats_entry',
+    'of_queue_desc',
 ])
 
 def build_class_metadata():