diff --git a/src/node/hooks/express/openapi.js b/src/node/hooks/express/openapi.js
index bf7e5b147..056a98a24 100644
--- a/src/node/hooks/express/openapi.js
+++ b/src/node/hooks/express/openapi.js
@@ -573,7 +573,6 @@ exports.expressCreateServer = (hookName, args, cb) => {
 
       // build openapi-backend instance for this api version
       const api = new OpenAPIBackend({
-        apiRoot, // each api version has its own root
         definition,
         validate: false,
         // for a small optimisation, we can run the quick startup for older