diff --git a/libs/ardour/luabindings.cc b/libs/ardour/luabindings.cc
index 2a2ca18624..fe6eda6ba3 100644
--- a/libs/ardour/luabindings.cc
+++ b/libs/ardour/luabindings.cc
@@ -973,6 +973,8 @@ LuaBindings::common (lua_State* L)
 		.addConst ("Discrete", Evoral::ControlList::InterpolationStyle(Evoral::ControlList::Discrete))
 		.addConst ("Linear", Evoral::ControlList::InterpolationStyle(Evoral::ControlList::Linear))
 		.addConst ("Curved", Evoral::ControlList::InterpolationStyle(Evoral::ControlList::Curved))
+		.addConst ("Logarithmic", Evoral::ControlList::InterpolationStyle(Evoral::ControlList::Logarithmic))
+		.addConst ("Exponential", Evoral::ControlList::InterpolationStyle(Evoral::ControlList::Exponential))
 		.endNamespace ()
 
 		.beginNamespace ("EventType")