diff --git a/build/p5_test.mjs b/build/p5_test.mjs
index f77d863..c188b8b 100644
--- a/build/p5_test.mjs
+++ b/build/p5_test.mjs
@@ -1,6 +1,7 @@
 import {run, p5} from "./ludus.mjs"
 
 const code = `
+print! ("Hello, world!")
 pencolor! (colors :white)
 repeat 10 {
   repeat 4 {