diff --git a/libs/ardour/enums.cc b/libs/ardour/enums.cc
index cab5bec9f5..4e75f2abab 100644
--- a/libs/ardour/enums.cc
+++ b/libs/ardour/enums.cc
@@ -852,6 +852,7 @@ setup_enum_writer ()
 	REGISTER_CLASS_ENUM (Trigger, Stopped);
 	REGISTER_CLASS_ENUM (Trigger, WaitingToStart);
 	REGISTER_CLASS_ENUM (Trigger, Running);
+	REGISTER_CLASS_ENUM (Trigger, Playout);
 	REGISTER_CLASS_ENUM (Trigger, WaitingForRetrigger);
 	REGISTER_CLASS_ENUM (Trigger, WaitingToStop);
 	REGISTER_CLASS_ENUM (Trigger, Stopping);