diff --git a/lib/omapi/include/omapi/omapi.h b/lib/omapi/include/omapi/omapi.h
index 9471783875..1a9581099b 100644
--- a/lib/omapi/include/omapi/omapi.h
+++ b/lib/omapi/include/omapi/omapi.h
@@ -158,6 +158,9 @@ omapi_message_create(omapi_object_t **message);
 void
 omapi_message_register(omapi_object_t *message);
 
+void
+omapi_message_unregister(omapi_object_t *message);
+
 isc_result_t
 omapi_message_send(omapi_object_t *message, omapi_object_t *protocol);