diff --git a/tests/wpt/mozilla/meta/MANIFEST.json b/tests/wpt/mozilla/meta/MANIFEST.json
index 683409fb6cc..c57a27a4d9e 100644
--- a/tests/wpt/mozilla/meta/MANIFEST.json
+++ b/tests/wpt/mozilla/meta/MANIFEST.json
@@ -27532,7 +27532,7 @@
    "testharness"
   ],
   "mozilla/paint_timing.html": [
-   "8cf0400c36168b57c386253d647b61013896d325",
+   "fb1100bdf9a5a3516f40fbb36e89714fe860830b",
    "testharness"
   ],
   "mozilla/parentNode_querySelector.html": [
diff --git a/tests/wpt/mozilla/tests/mozilla/paint_timing.html b/tests/wpt/mozilla/tests/mozilla/paint_timing.html
index 6bf5e7aae45..0c1798ec565 100644
--- a/tests/wpt/mozilla/tests/mozilla/paint_timing.html
+++ b/tests/wpt/mozilla/tests/mozilla/paint_timing.html
@@ -14,5 +14,5 @@ var observer = new PerformanceObserver(t.step_func_done(list => {
     assert_equals(entry.duration, 0, "Duration is 0");
   });
 }));
-observer.observe({entryTypes: ['paint']});
+observer.observe({entryTypes: ['paint'], buffered: true});
 </script>