diff --git a/yesod-auth/Yesod/Auth/BrowserId.hs b/yesod-auth/Yesod/Auth/BrowserId.hs
index 4fcfea84..6c4387cf 100644
--- a/yesod-auth/Yesod/Auth/BrowserId.hs
+++ b/yesod-auth/Yesod/Auth/BrowserId.hs
@@ -73,7 +73,6 @@ function #{rawJS onclick}() {
     navigator.id.watch({
         onlogin: function (assertion) {
             if (assertion) {
-                alert("@{toMaster complete}/" + assertion);
                 document.location = "@{toMaster complete}/" + assertion;
             }
         },