diff --git a/ui/dr-ui/tests/export_ignores_the_viewport.rs b/ui/dr-ui/tests/export_ignores_the_viewport.rs
index 14cac1c..f801989 100644
--- a/ui/dr-ui/tests/export_ignores_the_viewport.rs
+++ b/ui/dr-ui/tests/export_ignores_the_viewport.rs
@@ -75,7 +75,7 @@ fn an_export_is_the_same_frame_whether_or_not_the_canvas_is_zoomed() {
     let before = top_row_span(&unzoomed.rgba, unzoomed.width);
 
     // What a scroll wheel over the middle of the canvas does.
-    session.zoom_about(4.0, 0.5, 0.5);
+    session.zoom_about(4.0, 0.5, 0.5, 64, 64);
     assert!(session.is_zoomed(), "the session did not take the zoom");
 
     let zoomed = session
@@ -108,7 +108,7 @@ fn a_thumbnail_is_the_same_frame_whether_or_not_the_canvas_is_zoomed() {
     let (w, _, unzoomed) = session.render_thumbnail(32).expect("thumbnail");
     let before = top_row_span(&unzoomed, w);
 
-    session.zoom_about(4.0, 0.5, 0.5);
+    session.zoom_about(4.0, 0.5, 0.5, 64, 64);
     let (_, _, zoomed) = session.render_thumbnail(32).expect("thumbnail");
     let after = top_row_span(&zoomed, w);