diff --git a/libs/pbd/enums.cc b/libs/pbd/enums.cc
index afa156bb1e..fbeed72c6b 100644
--- a/libs/pbd/enums.cc
+++ b/libs/pbd/enums.cc
@@ -41,7 +41,7 @@ setup_libpbd_enums ()
 	REGISTER_CLASS_ENUM (Controllable, GainLike);
 	REGISTER_CLASS_ENUM (Controllable, RealTime);
 	REGISTER_CLASS_ENUM (Controllable, NotAutomatable);
-	REGISTER (controllable_flags);
+	REGISTER_BITS (controllable_flags);
 
 	REGISTER_CLASS_ENUM (Controllable, InverseGroup);
 	REGISTER_CLASS_ENUM (Controllable, UseGroup);