diff --git a/py_gen/templates/generic_util.py b/py_gen/templates/generic_util.py
index 99840ec..039d82a 100644
--- a/py_gen/templates/generic_util.py
+++ b/py_gen/templates/generic_util.py
@@ -35,6 +35,9 @@
 import loxi
 import struct
 
+def pack_list(values):
+    return "".join([x.pack() for x in values])
+
 def unpack_list(reader, deserializer):
     """
     The deserializer function should take an OFReader and return the new object.