diff --git a/samples/bounce.scm b/samples/bounce.scm
index 904b70d..a52e285 100644
--- a/samples/bounce.scm
+++ b/samples/bounce.scm
@@ -23,15 +23,15 @@
 		    (push-render-object 'screen
 					(visual-2d-layer vis-2d)
 					(lambda ()
-					  ((if (circle-2d-filled? circle)
-					       draw-circle
-					       draw-circle-lines)
-					   (inexact->exact (round (+ (vector-x (position transform))
-								     (vector-x (circle-2d-center circle)))))
-					   (inexact->exact (round (+ (vector-y (position transform))
-								     (vector-y (circle-2d-center circle)))))
-					   (circle-2d-radius circle)
-					   (use-color (visual-2d-color vis-2d))))))))))
+					  (let ((draw-pos (+ (position transform)
+							     (circle-2d-center circle))))
+					    ((if (circle-2d-filled? circle)
+						 draw-circle
+						 draw-circle-lines)
+					     (vector-x draw-pos)
+					     (vector-y draw-pos)
+					     (circle-2d-radius circle)
+					     (visual-2d-color vis-2d))))))))))
 
 
 (define-record-type <rigidbody-2d>