diff --git a/lib/web/auth.js b/lib/web/auth.js
index 8154d104..7aeb7c91 100644
--- a/lib/web/auth.js
+++ b/lib/web/auth.js
@@ -70,6 +70,8 @@ function handleLogin(req, res) {
             }
 
             if (req.hostname.indexOf(Config.get("http.root-domain")) >= 0) {
+                // Prevent non-root cookie from screwing things up
+                res.clearCookie("auth");
                 res.cookie("auth", auth, {
                     domain: Config.get("http.root-domain-dotted"),
                     expires: expiration,