diff --git a/mozilla/layout/html/document/src/ua.css b/mozilla/layout/html/document/src/ua.css
index 0d718b6652d..d5966977491 100644
--- a/mozilla/layout/html/document/src/ua.css
+++ b/mozilla/layout/html/document/src/ua.css
@@ -145,6 +145,7 @@
   padding: inherit;
   display: inherit;
   -moz-box-orient: inherit;
+  -moz-counter-reset: inherit;
 }
 
 *|*::-moz-page, *|*::-moz-page-sequence {
diff --git a/mozilla/layout/style/ua.css b/mozilla/layout/style/ua.css
index 0d718b6652d..d5966977491 100644
--- a/mozilla/layout/style/ua.css
+++ b/mozilla/layout/style/ua.css
@@ -145,6 +145,7 @@
   padding: inherit;
   display: inherit;
   -moz-box-orient: inherit;
+  -moz-counter-reset: inherit;
 }
 
 *|*::-moz-page, *|*::-moz-page-sequence {