diff --git a/tests/ref/basic.list b/tests/ref/basic.list
index 3be3072676c..00b9582d367 100644
--- a/tests/ref/basic.list
+++ b/tests/ref/basic.list
@@ -215,7 +215,6 @@ flaky_cpu == linebreak_simple_a.html linebreak_simple_b.html
!= ol_japanese_iroha_bullet_styles.html ol_japanese_iroha_ref.html
== ol_simple_a.html ol_simple_ref.html
== only_child_pseudo_a.html only_child_pseudo_b.html
-== only_of_type_pseudo_a.html only_of_type_pseudo_b.html
== opacity_simple_a.html opacity_simple_ref.html
== opacity_stacking_context_a.html opacity_stacking_context_ref.html
== outline_offset_a.html outline_offset_ref.html
diff --git a/tests/wpt/mozilla/meta/MANIFEST.json b/tests/wpt/mozilla/meta/MANIFEST.json
index 29d1b1b696f..8e60c313f37 100644
--- a/tests/wpt/mozilla/meta/MANIFEST.json
+++ b/tests/wpt/mozilla/meta/MANIFEST.json
@@ -683,6 +683,18 @@
"url": "/_mozilla/css/flex_nochild.html"
}
],
+ "css/only_of_type_pseudo_a.html": [
+ {
+ "path": "css/only_of_type_pseudo_a.html",
+ "references": [
+ [
+ "/_mozilla/css/only_of_type_pseudo_b.html",
+ "=="
+ ]
+ ],
+ "url": "/_mozilla/css/only_of_type_pseudo_a.html"
+ }
+ ],
"css/outlines_simple_a.html": [
{
"path": "css/outlines_simple_a.html",
@@ -3444,6 +3456,18 @@
"url": "/_mozilla/css/flex_nochild.html"
}
],
+ "css/only_of_type_pseudo_a.html": [
+ {
+ "path": "css/only_of_type_pseudo_a.html",
+ "references": [
+ [
+ "/_mozilla/css/only_of_type_pseudo_b.html",
+ "=="
+ ]
+ ],
+ "url": "/_mozilla/css/only_of_type_pseudo_a.html"
+ }
+ ],
"css/outlines_simple_a.html": [
{
"path": "css/outlines_simple_a.html",
diff --git a/tests/ref/only_of_type_pseudo_a.html b/tests/wpt/mozilla/tests/css/only_of_type_pseudo_a.html
similarity index 94%
rename from tests/ref/only_of_type_pseudo_a.html
rename to tests/wpt/mozilla/tests/css/only_of_type_pseudo_a.html
index ebd8286e834..3d33b074439 100644
--- a/tests/ref/only_of_type_pseudo_a.html
+++ b/tests/wpt/mozilla/tests/css/only_of_type_pseudo_a.html
@@ -1,6 +1,7 @@
+
:only-of-type test