1 files changed, 2 insertions, 1 deletions
diff --git a/tests/wpt/web-platform-tests/web-animations/resources/keyframe-utils.js b/tests/wpt/web-platform-tests/web-animations/resources/keyframe-utils.js
index 971e82ed81d..fdea1d8d93c 100644
--- a/tests/wpt/web-platform-tests/web-animations/resources/keyframe-utils.js
+++ b/tests/wpt/web-platform-tests/web-animations/resources/keyframe-utils.js
@@ -28,7 +28,8 @@ function assert_frames_equal(a, b, name) {
   assert_equals(Object.keys(a).sort().toString(),
                 Object.keys(b).sort().toString(),
                 `properties on ${name} should match`);
-  for (const p in a) {
+  // Iterates sorted keys to ensure stable failures.
+  for (const p of Object.keys(a).sort()) {
     assert_equals(a[p], b[p], `value for '${p}' on ${name}`);
   }
 }