diff --git a/tests/ref/basic.list b/tests/ref/basic.list
index 60fec7b6c70..9e39c3dc404 100644
--- a/tests/ref/basic.list
+++ b/tests/ref/basic.list
@@ -146,7 +146,6 @@ prefs:"layout.writing-mode.enabled" == iframe/size_attributes_vertical_writing_m
!= inset_blackborder.html blackborder_ref.html
== jpeg_normal.html jpeg_ref.html
== jpeg_progressive.html jpeg_ref.html
-== last_child_pseudo_a.html last_child_pseudo_b.html
== legacy_cellspacing_attribute_a.html border_spacing_ref.html
== legacy_td_width_attribute_a.html legacy_td_width_attribute_ref.html
== legacy_th_width_attribute_a.html legacy_td_width_attribute_ref.html
diff --git a/tests/wpt/mozilla/meta/MANIFEST.json b/tests/wpt/mozilla/meta/MANIFEST.json
index 98df444693a..f02f599f18d 100644
--- a/tests/wpt/mozilla/meta/MANIFEST.json
+++ b/tests/wpt/mozilla/meta/MANIFEST.json
@@ -839,6 +839,18 @@
"url": "/_mozilla/css/jumpiness_a.html"
}
],
+ "css/last_child_pseudo_a.html": [
+ {
+ "path": "css/last_child_pseudo_a.html",
+ "references": [
+ [
+ "/_mozilla/css/last_child_pseudo_b.html",
+ "=="
+ ]
+ ],
+ "url": "/_mozilla/css/last_child_pseudo_a.html"
+ }
+ ],
"css/last_of_type_pseudo_a.html": [
{
"path": "css/last_of_type_pseudo_a.html",
@@ -4224,6 +4236,18 @@
"url": "/_mozilla/css/jumpiness_a.html"
}
],
+ "css/last_child_pseudo_a.html": [
+ {
+ "path": "css/last_child_pseudo_a.html",
+ "references": [
+ [
+ "/_mozilla/css/last_child_pseudo_b.html",
+ "=="
+ ]
+ ],
+ "url": "/_mozilla/css/last_child_pseudo_a.html"
+ }
+ ],
"css/last_of_type_pseudo_a.html": [
{
"path": "css/last_of_type_pseudo_a.html",
diff --git a/tests/ref/last_child_pseudo_a.html b/tests/wpt/mozilla/tests/css/last_child_pseudo_a.html
similarity index 93%
rename from tests/ref/last_child_pseudo_a.html
rename to tests/wpt/mozilla/tests/css/last_child_pseudo_a.html
index 4e68475084f..fc18ebbd775 100644
--- a/tests/ref/last_child_pseudo_a.html
+++ b/tests/wpt/mozilla/tests/css/last_child_pseudo_a.html
@@ -1,6 +1,7 @@
+
:last-child test