diff --git a/libs/ardour/luabindings.cc b/libs/ardour/luabindings.cc
index 8ac349f02c..f7e00502a0 100644
--- a/libs/ardour/luabindings.cc
+++ b/libs/ardour/luabindings.cc
@@ -315,6 +315,8 @@ CLASSKEYS(LuaDialog::Message);
 CLASSKEYS(LuaDialog::Dialog);
 CLASSKEYS(LuaDialog::ProgressWindow);
 
+CLASSKEYS(UIConfiguration);
+
 #endif // end windows special case
 
 /* Some notes on Lua bindings for libardour and friends