diff --git a/ed/csspatches/css-mixins.json.patch b/ed/csspatches/css-mixins.json.patch
new file mode 100644
index 000000000000..3ddea612b95e
--- /dev/null
+++ b/ed/csspatches/css-mixins.json.patch
@@ -0,0 +1,35 @@
+From 2e9d278fb762e1f57bfc999655ad7711162216f6 Mon Sep 17 00:00:00 2001
+From: Francois Daoust <fd@tidoust.net>
+Date: Fri, 12 Jul 2024 08:53:38 +0200
+Subject: [PATCH] Namespace `<combinator>` production to css-mixins
+
+Reported in: https://github.com/w3c/csswg-drafts/issues/10557
+---
+ ed/css/css-mixins.json | 4 ++--
+ 1 file changed, 2 insertions(+), 2 deletions(-)
+
+diff --git a/ed/css/css-mixins.json b/ed/css/css-mixins.json
+index 27a491ee8..d74b55722 100644
+--- a/ed/css/css-mixins.json
++++ b/ed/css/css-mixins.json
+@@ -65,7 +65,7 @@
+       "value": "angle | color | custom-ident | image | integer | length | length-percentage | number | percentage | resolution | string | time | url | transform-function"
+     },
+     {
+-      "name": "<combinator>",
++      "name": "<mixins-combinator>",
+       "href": "https://drafts.csswg.org/css-mixins-1/#typedef-combinator",
+       "type": "type",
+       "value": "'|'"
+@@ -92,7 +92,7 @@
+       "name": "<syntax>",
+       "href": "https://drafts.csswg.org/css-mixins-1/#typedef-syntax",
+       "type": "type",
+-      "value": "'*' | <syntax-component> [ <combinator> <syntax-component> ]+"
++      "value": "'*' | <syntax-component> [ <mixins-combinator> <syntax-component> ]+"
+     }
+   ],
+   "warnings": [
+-- 
+2.42.0.windows.2
+