diff --git a/examples/return-value/Main.hx b/examples/return-value/Main.hx
index 984134b..651a6f6 100644
--- a/examples/return-value/Main.hx
+++ b/examples/return-value/Main.hx
@@ -22,9 +22,13 @@ class Main
 		/* run the script */
 		LuaL.dofile(vm, "script.lua");
 
-		trace('stack: ${Lua.gettop(vm)}');
+		final stack:Int = Lua.gettop(vm);
 
-		trace('num: ' + Lua.tointeger(vm, 1));
+		trace('stack: $stack');
+
+		final num:Int = Lua.tointeger(vm, 1);
+
+		trace('num: $num');
 
 		/* cleanup Lua */
 		Lua.close(vm);