diff --git a/.github/workflows/auto-publish.yml b/.github/workflows/auto-publish.yml
index 0e54bca..0a08b19 100644
--- a/.github/workflows/auto-publish.yml
+++ b/.github/workflows/auto-publish.yml
@@ -14,6 +14,7 @@ jobs:
       - uses: actions/checkout@v3
       - uses: w3c/spec-prod@v2
         with:
+          VALIDATE_INPUT_MARKUP: true
           W3C_ECHIDNA_TOKEN: ${{ secrets.ECHIDNA_TOKEN }}
           W3C_WG_DECISION_URL: "https://lists.w3.org/Archives/Public/public-webapps/2014JulSep/0627.html"
           W3C_NOTIFICATIONS_CC: "marcos@marcosc.com"