diff --git a/aio/tools/transforms/angular.io-package/index.js b/aio/tools/transforms/angular.io-package/index.js
index 77ac13f9e1..1964bb696a 100644
--- a/aio/tools/transforms/angular.io-package/index.js
+++ b/aio/tools/transforms/angular.io-package/index.js
@@ -47,4 +47,5 @@ module.exports = new Package('angular.io', [gitPackage, apiPackage, contentPacka
       }
     });
     checkAnchorLinksProcessor.pathVariants = ['', '/', '.html', '/index.html', '#top-of-page'];
+    checkAnchorLinksProcessor.errorOnUnmatchedLinks = true;
   });