diff --git a/tests/ref/basic.list b/tests/ref/basic.list
index 4d4d2fe99c9..d274da12d91 100644
--- a/tests/ref/basic.list
+++ b/tests/ref/basic.list
@@ -296,7 +296,6 @@ resolution=300x300,device-pixel-ratio=2 != pixel_snapping_position_a.html pixel_
== rtl_margin_a.html rtl_margin_ref.html
== rtl_simple.html rtl_simple_ref.html
== rtl_table_a.html rtl_table_ref.html
-== servo_center_a.html servo_center_ref.html
# text_decoration_propagation_a.html text_decoration_propagation_b.html
!= text_decoration_smoke_a.html text_decoration_smoke_ref.html
!= text_decoration_underline_subpx_a.html text_decoration_underline_subpx_ref.html
diff --git a/tests/wpt/mozilla/meta/MANIFEST.json b/tests/wpt/mozilla/meta/MANIFEST.json
index e326da56711..e5b39863e76 100644
--- a/tests/wpt/mozilla/meta/MANIFEST.json
+++ b/tests/wpt/mozilla/meta/MANIFEST.json
@@ -579,6 +579,18 @@
"url": "/_mozilla/css/flex_nochild.html"
}
],
+ "css/servo_center_a.html": [
+ {
+ "path": "css/servo_center_a.html",
+ "references": [
+ [
+ "/_mozilla/css/servo_center_ref.html",
+ "=="
+ ]
+ ],
+ "url": "/_mozilla/css/servo_center_a.html"
+ }
+ ],
"css/setattribute_id_restyle_a.html": [
{
"path": "css/setattribute_id_restyle_a.html",
@@ -2648,6 +2660,18 @@
"url": "/_mozilla/css/flex_nochild.html"
}
],
+ "css/servo_center_a.html": [
+ {
+ "path": "css/servo_center_a.html",
+ "references": [
+ [
+ "/_mozilla/css/servo_center_ref.html",
+ "=="
+ ]
+ ],
+ "url": "/_mozilla/css/servo_center_a.html"
+ }
+ ],
"css/setattribute_id_restyle_a.html": [
{
"path": "css/setattribute_id_restyle_a.html",
diff --git a/tests/ref/servo_center_a.html b/tests/wpt/mozilla/tests/css/servo_center_a.html
similarity index 81%
rename from tests/ref/servo_center_a.html
rename to tests/wpt/mozilla/tests/css/servo_center_a.html
index b43bf1830b0..047191730c3 100644
--- a/tests/ref/servo_center_a.html
+++ b/tests/wpt/mozilla/tests/css/servo_center_a.html
@@ -1,6 +1,7 @@
+