diff --git a/pkgs/htdp-pkgs/htdp-lib/2htdp/tests/run-movie.rkt b/pkgs/htdp-pkgs/htdp-lib/2htdp/tests/run-movie.rkt
index 00554ac82e..460388d566 100644
--- a/pkgs/htdp-pkgs/htdp-lib/2htdp/tests/run-movie.rkt
+++ b/pkgs/htdp-pkgs/htdp-lib/2htdp/tests/run-movie.rkt
@@ -10,4 +10,4 @@
 (define DOT (circle 3 'solid 'red))
 (define BACKGROUND (empty-scene 100 400))
 
-(run-movie 8 (make-images 8))
+(run-movie 1/8 (make-images 8))