diff --git a/libs/ardour/region.cc b/libs/ardour/region.cc
index 7218c72198..b0d78eb34d 100644
--- a/libs/ardour/region.cc
+++ b/libs/ardour/region.cc
@@ -145,6 +145,8 @@ Region::make_property_quarks ()
 	DEBUG_TRACE (DEBUG::Properties, string_compose ("quark for tags = %1\n",	Properties::tags.property_id));
 	Properties::contents.property_id = g_quark_from_static_string (X_("contents"));
 	DEBUG_TRACE (DEBUG::Properties, string_compose ("quark for contents = %1\n",	Properties::contents.property_id));
+	Properties::time_domain.property_id = g_quark_from_static_string (X_("time_domain"));
+	DEBUG_TRACE (DEBUG::Properties, string_compose ("quark for time_domain = %1\n",	Properties::time_domain.property_id));
 }
 
 void