1 files changed, 2 insertions, 1 deletions
diff --git a/tests/wpt/web-platform-tests/css/css-layout-api/constraints-data-sab-failure.https.html b/tests/wpt/web-platform-tests/css/css-layout-api/constraints-data-sab-failure.https.html
index 8659c2edef5..b8df61c73d3 100644
--- a/tests/wpt/web-platform-tests/css/css-layout-api/constraints-data-sab-failure.https.html
+++ b/tests/wpt/web-platform-tests/css/css-layout-api/constraints-data-sab-failure.https.html
@@ -35,7 +35,8 @@ registerLayout('parent', class {
 
     try {
       childFragment = await child.layoutNextFragment({
-        data: { sab: new SharedArrayBuffer(4) }
+        // See https://github.com/whatwg/html/issues/5380 for why not `new SharedArrayBuffer()`
+        data: { sab: new WebAssembly.Memory({ shared:true, initial:1, maximum:1 }).buffer }
       });
     } catch(e) {
       // Success! The structured cloning algorithm should have thrown an error.