diff --git a/packages/govuk-frontend/.htmlvalidate.js b/packages/govuk-frontend/.htmlvalidate.js
index 7044b1f904..3e1569acda 100644
--- a/packages/govuk-frontend/.htmlvalidate.js
+++ b/packages/govuk-frontend/.htmlvalidate.js
@@ -18,9 +18,6 @@ module.exports = {
     // Require input to have a label
     'input-missing-label': 'error',
 
-    // Allow for conditional comments (used in header for fallback png)
-    'no-conditional-comment': 'off',
-
     // Allow inline styles for testing purposes
     'no-inline-style': 'off',