diff --git a/tests/ref/basic.list b/tests/ref/basic.list
index 36656d0de1e..778aa7c475a 100644
--- a/tests/ref/basic.list
+++ b/tests/ref/basic.list
@@ -14,7 +14,6 @@ flaky_cpu == append_style_a.html append_style_b.html
 == border_spacing_auto_layout_a.html border_spacing_ref.html
 == border_spacing_fixed_layout_a.html border_spacing_ref.html
 == borders_a.html borders_b.html
-== box_shadow_bg.html box_shadow_bg_ref.html
 != box_shadow_blur_a.html box_shadow_blur_ref.html
 == box_shadow_default_color_a.html box_shadow_default_color_ref.html
 == box_shadow_inset_a.html box_shadow_inset_ref.html
diff --git a/tests/wpt/mozilla/meta/MANIFEST.json b/tests/wpt/mozilla/meta/MANIFEST.json
index 53b568c7f13..3e6f6494f7d 100644
--- a/tests/wpt/mozilla/meta/MANIFEST.json
+++ b/tests/wpt/mozilla/meta/MANIFEST.json
@@ -815,6 +815,18 @@
             "url": "/_mozilla/css/border_style_none_a.html"
           }
         ],
+        "css/box_shadow_bg.html": [
+          {
+            "path": "css/box_shadow_bg.html",
+            "references": [
+              [
+                "/_mozilla/css/box_shadow_bg_ref.html",
+                "=="
+              ]
+            ],
+            "url": "/_mozilla/css/box_shadow_bg.html"
+          }
+        ],
         "css/box_shadow_border_box_a.html": [
           {
             "path": "css/box_shadow_border_box_a.html",
@@ -5328,6 +5340,18 @@
           "url": "/_mozilla/css/border_style_none_a.html"
         }
       ],
+      "css/box_shadow_bg.html": [
+        {
+          "path": "css/box_shadow_bg.html",
+          "references": [
+            [
+              "/_mozilla/css/box_shadow_bg_ref.html",
+              "=="
+            ]
+          ],
+          "url": "/_mozilla/css/box_shadow_bg.html"
+        }
+      ],
       "css/box_shadow_border_box_a.html": [
         {
           "path": "css/box_shadow_border_box_a.html",
diff --git a/tests/ref/box_shadow_bg.html b/tests/wpt/mozilla/tests/css/box_shadow_bg.html
similarity index 75%
rename from tests/ref/box_shadow_bg.html
rename to tests/wpt/mozilla/tests/css/box_shadow_bg.html
index 6a2bcc9a7ea..8fd3568aa40 100644
--- a/tests/ref/box_shadow_bg.html
+++ b/tests/wpt/mozilla/tests/css/box_shadow_bg.html
@@ -1,3 +1,4 @@
+<link rel='match' href='box_shadow_bg_ref.html'>
 <div></div>
 
 <style>
diff --git a/tests/ref/box_shadow_bg_ref.html b/tests/wpt/mozilla/tests/css/box_shadow_bg_ref.html
similarity index 100%
rename from tests/ref/box_shadow_bg_ref.html
rename to tests/wpt/mozilla/tests/css/box_shadow_bg_ref.html