diff --git a/packages/builder/src/builder.js b/packages/builder/src/builder.js
index 2b96275e90..0b7d16cd50 100644
--- a/packages/builder/src/builder.js
+++ b/packages/builder/src/builder.js
@@ -369,7 +369,7 @@ export default class Builder {
         trailingSlash
       })
     } else { // If user defined a custom method to create routes
-      templateVars.router.routes = this.options.build.createRoutes(
+      templateVars.router.routes = await this.options.build.createRoutes(
         this.options.srcDir
       )
     }