diff --git a/packages/react/src/Radio/Radio.module.css b/packages/react/src/Radio/Radio.module.css
index 2032cb8a697..ba572046e38 100644
--- a/packages/react/src/Radio/Radio.module.css
+++ b/packages/react/src/Radio/Radio.module.css
@@ -4,7 +4,7 @@
     background-color,
     border-color 80ms cubic-bezier(0.33, 1, 0.68, 1); /* checked -> unchecked - add 120ms delay to fully see animation-out */
 
-  &:where(:checked) {
+  &:is(:checked) {
     /* stylelint-disable-next-line primer/colors */
     background-color: var(--control-checked-fgColor-rest);