diff --git a/tests/canvas.bjo b/tests/canvas.bjo
index 4215c35..7c49f23 100644
--- a/tests/canvas.bjo
+++ b/tests/canvas.bjo
@@ -129,8 +129,8 @@
   (defun (click path)
     (raise-event (cast Interactive (ctl path)) (RoutedEventArgs. (cast RoutedEvent click-event))))
   (defun (both) (.pair (app-model app)))
-  (defun (left-of (: c Control)) (left-of* (cast AvaloniaObject c)))
-  (defun (top-of (: c Control)) (top-of* (cast AvaloniaObject c)))
+  (defun (left-of c) (left-of* (cast AvaloniaObject c)))
+  (defun (top-of c) (top-of* (cast AvaloniaObject c)))
 
   ;; --- view-map ---------------------------------------------------------------------
   (click '(0 1 0))