diff --git a/styles/sass/welshgov/_application.scss b/styles/sass/welshgov/_application.scss
index 15d74407..255912ee 100644
--- a/styles/sass/welshgov/_application.scss
+++ b/styles/sass/welshgov/_application.scss
@@ -11,6 +11,7 @@ html {
 .govuk-heading-xl,
 .govuk-heading-l,
 .govuk-heading-m,
+.govuk-heading-s,
 .govuk-header-l,
 .govuk-header-m,
 .govuk-header__link,