diff --git a/openflow_input/bsn_vport b/openflow_input/bsn_vport
index 06198df..52f7c1d 100644
--- a/openflow_input/bsn_vport
+++ b/openflow_input/bsn_vport
@@ -45,7 +45,7 @@
 // BSN Virtual port object header
 // FIXME For now, inheritance is not exercised.  See below.
 struct of_bsn_vport {
-    uint16_t type;  /* Discriminate virtual port type */
+    uint16_t type == ?;  /* Discriminate virtual port type */
     uint16_t length; /* Length in bytes of this structure with this header */
     /* Remainder of data is specific to the port type */
 };
diff --git a/openflow_input/standard-1.3 b/openflow_input/standard-1.3
index ed2610b..7a58b60 100644
--- a/openflow_input/standard-1.3
+++ b/openflow_input/standard-1.3
@@ -569,7 +569,7 @@
 };
 
 struct of_hello_elem {
-    uint16_t type;
+    uint16_t type == ?;
     uint16_t length;
 };