diff --git a/tests/wpt/metadata-layout-2020/css/css-ui/parsing/outline-offset-computed.html.ini b/tests/wpt/metadata-layout-2020/css/css-ui/parsing/outline-offset-computed.html.ini
index 8cefcef6475..d4b87e29f2c 100644
--- a/tests/wpt/metadata-layout-2020/css/css-ui/parsing/outline-offset-computed.html.ini
+++ b/tests/wpt/metadata-layout-2020/css/css-ui/parsing/outline-offset-computed.html.ini
@@ -1,4 +1,7 @@
 [outline-offset-computed.html]
+  [Property outline-offset value '2.5px']
+    expected: FAIL
+
   [Property outline-offset value '0.5em']
     expected: FAIL