diff --git a/libs/ardour/luabindings.cc b/libs/ardour/luabindings.cc
index eba8e9cf7b..09771888b5 100644
--- a/libs/ardour/luabindings.cc
+++ b/libs/ardour/luabindings.cc
@@ -229,6 +229,10 @@ CLASSKEYS(ARDOUR::Source);
 CLASSKEYS(ARDOUR::VCA);
 CLASSKEYS(ARDOUR::VCAManager);
 
+CLASSKEYS(ARDOUR::timepos_t)
+CLASSKEYS(ARDOUR::timecnt_t)
+CLASSKEYS(ARDOUR::superclock_t
+
 CLASSKEYS(PBD::ID);
 CLASSKEYS(PBD::Configuration);
 CLASSKEYS(PBD::PropertyChange);