diff --git a/apps/_example_clock/clock.js b/apps/_example_clock/app.js
similarity index 96%
rename from apps/_example_clock/clock.js
rename to apps/_example_clock/app.js
index 7e97cf758..0df138d11 100644
--- a/apps/_example_clock/clock.js
+++ b/apps/_example_clock/app.js
@@ -1,5 +1,5 @@
 // timeout used to update every minute
-var drawTimeout;
+let drawTimeout;
 
 // schedule a draw for the next minute
 function queueDraw() {