diff --git a/libs/pbd/enums.cc b/libs/pbd/enums.cc
index ee4595752f..e2445162df 100644
--- a/libs/pbd/enums.cc
+++ b/libs/pbd/enums.cc
@@ -40,6 +40,7 @@ setup_libpbd_enums ()
 	REGISTER_CLASS_ENUM (Controllable, GainLike);
 	REGISTER_CLASS_ENUM (Controllable, RealTime);
 	REGISTER_CLASS_ENUM (Controllable, NotAutomatable);
+	REGISTER_CLASS_ENUM (Controllable, InlineControl);
 	REGISTER_BITS (controllable_flags);
 
 	REGISTER_CLASS_ENUM (Controllable, InverseGroup);