diff --git a/app/server/lib/FlexServer.ts b/app/server/lib/FlexServer.ts
index aa3f55945e..b2b5886954 100644
--- a/app/server/lib/FlexServer.ts
+++ b/app/server/lib/FlexServer.ts
@@ -599,14 +599,7 @@ export class FlexServer implements GristServer {
    */
   public addBootPage() {
     if (this._check('boot')) { return; }
-    /* The regex above captures routes like
-       /boot
-       /boot/
-       /boot/KEY/
-       /boot/KEY
-       /boot//
-    */
-    this.app.get(/\/boot(\/(.*\/?)?)?$/, async (req, res) => {
+    this.app.get('/boot(/*)?', async (req, res) => {
       // Doing a good redirect is actually pretty subtle and we might
       // get it wrong, so just say /boot got moved.
       res.send('The /boot/KEY page is now /admin?boot-key=KEY');