diff --git a/src/off_topic.gleam b/src/off_topic.gleam
index 870020a..5297252 100644
--- a/src/off_topic.gleam
+++ b/src/off_topic.gleam
@@ -1749,7 +1749,7 @@ pub fn on_animation_frame_delta(
     use last_time <- foldp(None)
     let now = timestamp.system_time()
     let last_time = option.unwrap(last_time, now)
-    #(Some(now), message(timestamp.difference(now, last_time)))
+    #(Some(now), message(timestamp.difference(last_time, now)))
   })
 }