diff --git a/lib/build.js b/lib/build.js
index d3596cb3e9..6f5e1c5a1a 100644
--- a/lib/build.js
+++ b/lib/build.js
@@ -210,7 +210,7 @@ function * generateRoutesAndFiles () {
   templateVars.router.routes = createRoutes(files, this.srcDir)
   if (typeof this.options.router.extendRoutes === 'function') {
     // let the user extend the routes
-    this.options.router.extendRoutes(templateVars.router.routes)
+    this.options.router.extendRoutes(templateVars.router.routes, r)
   }
   // Routes for Generate command
   this.routes = flatRoutes(templateVars.router.routes, '')