diff --git a/tests/ref/basic.list b/tests/ref/basic.list
index 757c7965cc0..4de8d033368 100644
--- a/tests/ref/basic.list
+++ b/tests/ref/basic.list
@@ -347,7 +347,6 @@ resolution=300x300,device-pixel-ratio=2 != pixel_snapping_position_a.html pixel_
== transform_optimization.html transform_optimization_ref.html
== transform_simple_a.html transform_simple_ref.html
== transform_skew_a.html transform_skew_ref.html
-== transform_stacking_context_a.html transform_stacking_context_ref.html
flaky_cpu,prefs:"layout.writing-mode.enabled" == vertical-lr-blocks.html vertical-lr-blocks_ref.html
== vertical_align_bottom_a.html vertical_align_bottom_ref.html
== vertical_align_inline_block_a.html vertical_align_inline_block_ref.html
diff --git a/tests/wpt/mozilla/meta/MANIFEST.json b/tests/wpt/mozilla/meta/MANIFEST.json
index 344b26e79ca..cec0c584107 100644
--- a/tests/wpt/mozilla/meta/MANIFEST.json
+++ b/tests/wpt/mozilla/meta/MANIFEST.json
@@ -603,6 +603,18 @@
"url": "/_mozilla/css/stacking_context_rtl.html"
}
],
+ "css/transform_stacking_context_a.html": [
+ {
+ "path": "css/transform_stacking_context_a.html",
+ "references": [
+ [
+ "/_mozilla/css/transform_stacking_context_ref.html",
+ "=="
+ ]
+ ],
+ "url": "/_mozilla/css/transform_stacking_context_a.html"
+ }
+ ],
"css/transition_calc.html": [
{
"path": "css/transition_calc.html",
@@ -2024,6 +2036,18 @@
"url": "/_mozilla/css/stacking_context_rtl.html"
}
],
+ "css/transform_stacking_context_a.html": [
+ {
+ "path": "css/transform_stacking_context_a.html",
+ "references": [
+ [
+ "/_mozilla/css/transform_stacking_context_ref.html",
+ "=="
+ ]
+ ],
+ "url": "/_mozilla/css/transform_stacking_context_a.html"
+ }
+ ],
"css/transition_calc.html": [
{
"path": "css/transition_calc.html",
diff --git a/tests/ref/transform_stacking_context_a.html b/tests/wpt/mozilla/tests/css/transform_stacking_context_a.html
similarity index 91%
rename from tests/ref/transform_stacking_context_a.html
rename to tests/wpt/mozilla/tests/css/transform_stacking_context_a.html
index d966f9676f3..15dcf3e8326 100644
--- a/tests/ref/transform_stacking_context_a.html
+++ b/tests/wpt/mozilla/tests/css/transform_stacking_context_a.html
@@ -1,6 +1,7 @@
+