diff --git a/examples/lenna.ce b/examples/lenna.ce
index dceccf3..cc92ba3 100644
--- a/examples/lenna.ce
+++ b/examples/lenna.ce
@@ -93,7 +93,7 @@ function frame() {
       return
     }
     if (ev.type == "key_down" || ev.type == "key_up") {
-      var key_name = keyboard.get_key_name(ev.key).toLowerCase()
+      var key_name = lower(keyboard.get_key_name(ev.key))
       var pressed = ev.type == "key_down"
       if (key_name == "w") keys.w = pressed
       if (key_name == "a") keys.a = pressed