diff --git a/testing/web-platform/meta/css/css-fonts/variations/at-font-face-descriptors.html.ini b/testing/web-platform/meta/css/css-fonts/variations/at-font-face-descriptors.html.ini
index 7ee9f1c14edcc..6c0f2033ba3ad 100644
--- a/testing/web-platform/meta/css/css-fonts/variations/at-font-face-descriptors.html.ini
+++ b/testing/web-platform/meta/css/css-fonts/variations/at-font-face-descriptors.html.ini
@@ -169,3 +169,6 @@
 
   [font-style(valid): 'auto' keyword inside @font-face: auto]
     expected: FAIL
+
+  [font-style(valid): 'oblique' followed by angle in radians: oblique 0rad]
+    expected: FAIL