diff --git a/tests/ref/basic.list b/tests/ref/basic.list
index fc1940bf0ae..e900a9b40b4 100644
--- a/tests/ref/basic.list
+++ b/tests/ref/basic.list
@@ -206,7 +206,6 @@ flaky_cpu == linebreak_simple_a.html linebreak_simple_b.html
== noscript.html noscript_ref.html
!= noteq_attr_exists_selector.html attr_exists_selector_ref.html
== nth_child_pseudo_a.html nth_child_pseudo_b.html
-== nth_last_child_pseudo_a.html nth_last_child_pseudo_b.html
== nth_last_of_type_pseudo_a.html nth_last_of_type_pseudo_b.html
== nth_of_type_pseudo_a.html nth_of_type_pseudo_b.html
== object_element_a.html object_element_b.html
diff --git a/tests/wpt/mozilla/meta/MANIFEST.json b/tests/wpt/mozilla/meta/MANIFEST.json
index 15e0fdcfde2..3c660d7e439 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/nth_last_child_pseudo_a.html": [
+ {
+ "path": "css/nth_last_child_pseudo_a.html",
+ "references": [
+ [
+ "/_mozilla/css/nth_last_child_pseudo_b.html",
+ "=="
+ ]
+ ],
+ "url": "/_mozilla/css/nth_last_child_pseudo_a.html"
+ }
+ ],
"css/ol_simple_a.html": [
{
"path": "css/ol_simple_a.html",
@@ -3504,6 +3516,18 @@
"url": "/_mozilla/css/flex_nochild.html"
}
],
+ "css/nth_last_child_pseudo_a.html": [
+ {
+ "path": "css/nth_last_child_pseudo_a.html",
+ "references": [
+ [
+ "/_mozilla/css/nth_last_child_pseudo_b.html",
+ "=="
+ ]
+ ],
+ "url": "/_mozilla/css/nth_last_child_pseudo_a.html"
+ }
+ ],
"css/ol_simple_a.html": [
{
"path": "css/ol_simple_a.html",
diff --git a/tests/ref/nth_last_child_pseudo_a.html b/tests/wpt/mozilla/tests/css/nth_last_child_pseudo_a.html
similarity index 97%
rename from tests/ref/nth_last_child_pseudo_a.html
rename to tests/wpt/mozilla/tests/css/nth_last_child_pseudo_a.html
index e70312c4804..838ffe45650 100644
--- a/tests/ref/nth_last_child_pseudo_a.html
+++ b/tests/wpt/mozilla/tests/css/nth_last_child_pseudo_a.html
@@ -1,6 +1,7 @@
+
:nth-last-child test