diff --git a/readthedocs/core/static-src/core/js/doc-embed/sponsorship.js b/readthedocs/core/static-src/core/js/doc-embed/sponsorship.js
index 647ee0a3f44..bff2f9cd6e6 100644
--- a/readthedocs/core/static-src/core/js/doc-embed/sponsorship.js
+++ b/readthedocs/core/static-src/core/js/doc-embed/sponsorship.js
@@ -280,7 +280,7 @@ function init() {
         error: function () {
             console.error('Error loading Read the Docs promo');
 
-            if (!rtddata.ad_free && rtd.api_host === 'https://readthedocs.org' && detect_adblock()) {
+            if (!rtd.ad_free && rtd.api_host === 'https://readthedocs.org' && detect_adblock()) {
                 adblock_admonition();
                 adblock_nag();
             }