diff --git a/crates/oa-desktop/src/diagram/grid/tests.rs b/crates/oa-desktop/src/diagram/grid/tests.rs
index 2d303189..a27de37e 100644
--- a/crates/oa-desktop/src/diagram/grid/tests.rs
+++ b/crates/oa-desktop/src/diagram/grid/tests.rs
@@ -228,8 +228,10 @@ fn pixels(renderer: &mut Renderer, size: Size, geometry: Vec<canvas::Geometry>)
 fn assert_same_pixels(expected: &[u8], actual: &[u8], label: &str) {
     assert_eq!(expected.len(), actual.len(), "{label}: dimensions");
     let differing = expected
-        .chunks_exact(4)
-        .zip(actual.chunks_exact(4))
+        .as_chunks::<4>()
+        .0
+        .iter()
+        .zip(actual.as_chunks::<4>().0)
         .filter(|(a, b)| a != b)
         .count();
     assert_eq!(differing, 0, "{label}: changed RGBA pixels");