diff --git a/keyserver/src/keyserver.js b/keyserver/src/keyserver.js
--- a/keyserver/src/keyserver.js
+++ b/keyserver/src/keyserver.js
@@ -127,6 +127,13 @@
     // and prevent commAppRouter and landingRouter from working correctly. So we
     // make sure that squadCalRouter goes last
 
+    // This endpoint should be handled by the mobile app. If the server
+    // receives this request, it means that the app is not installed and we
+    // should redirect the user to a place from which the app can be
+    // downloaded. It's important to define it before any other router so that
+    // it won't get handled by e.g. `/` rule.
+    server.get('/invite/:secret', inviteResponder);
+
     if (landingBaseRoutePath) {
       const landingRouter = express.Router();
       landingRouter.use('/images', express.static('images'));
@@ -141,12 +148,6 @@
       server.use(landingBaseRoutePath, landingRouter);
     }
 
-    // This endpoint should be handled by the mobile app. If the server
-    // receives this request, it means that the app is not installed and we
-    // should redirect the user to a place from which the app can be
-    // downloaded.
-    server.get('/invite/:secret', inviteResponder);
-
     if (commAppBaseRoutePath) {
       const commAppRouter = express.Router();
       setupAppRouter(commAppRouter);