diff --git a/ryu/lib/packet/llc.py b/ryu/lib/packet/llc.py
index 12d557da..6db9b9dd 100644
--- a/ryu/lib/packet/llc.py
+++ b/ryu/lib/packet/llc.py
@@ -318,3 +318,4 @@ class ControlFormatU(stringify.StringifyMixin):
 
 
 llc.register_packet_type(bpdu.bpdu, SAP_BPDU)
+llc.set_classes(llc._CTR_TYPES)