diff --git a/stepmania/Themes/default/Scripts/ActorDef.lua b/stepmania/Themes/default/Scripts/ActorDef.lua
index 1fb9c190e0..a4b0c49da6 100644
--- a/stepmania/Themes/default/Scripts/ActorDef.lua
+++ b/stepmania/Themes/default/Scripts/ActorDef.lua
@@ -23,6 +23,7 @@ local function MergeTables( left, right )
 
 		ret[key] = val;
 	end
+	setmetatable( ret, getmetatable(left) );
 	return ret
 end