diff --git a/.changeset/blue-stingrays-decide.md b/.changeset/blue-stingrays-decide.md
new file mode 100644
index 00000000000..48d40f5449b
--- /dev/null
+++ b/.changeset/blue-stingrays-decide.md
@@ -0,0 +1,5 @@
+---
+"@primer/react": patch
+---
+
+Add `:where()` selector to classes that land on nodes that have a `sx` prop.
diff --git a/packages/react/src/Heading/Heading.module.css b/packages/react/src/Heading/Heading.module.css
index eb758e66331..df66c322d6b 100644
--- a/packages/react/src/Heading/Heading.module.css
+++ b/packages/react/src/Heading/Heading.module.css
@@ -1,4 +1,4 @@
-.Heading {
+:where(.Heading) {
   margin: 0;
   font-size: var(--text-title-size-large);
   font-weight: var(--base-text-weight-semibold);
diff --git a/packages/react/src/Link/Link.module.css b/packages/react/src/Link/Link.module.css
index 6f88d9e3ad2..51684908da0 100644
--- a/packages/react/src/Link/Link.module.css
+++ b/packages/react/src/Link/Link.module.css
@@ -1,4 +1,4 @@
-.Link {
+:where(.Link) {
   color: var(--fgColor-accent);
   text-decoration: none;