diff --git a/lib/transports-uws/polling.ts b/lib/transports-uws/polling.ts
index 4ce6e52f..16e72c00 100644
--- a/lib/transports-uws/polling.ts
+++ b/lib/transports-uws/polling.ts
@@ -55,6 +55,8 @@ export class Polling extends Transport {
    */
   onRequest(req) {
     const res = req.res;
+    // remove the reference to the ServerResponse object (as the first request of the session is kept in memory by default)
+    req.res = null;
 
     if (req.getMethod() === "get") {
       this.onPollRequest(req, res);
diff --git a/lib/transports/polling.ts b/lib/transports/polling.ts
index f0edcdc8..e5ea24cf 100644
--- a/lib/transports/polling.ts
+++ b/lib/transports/polling.ts
@@ -54,6 +54,8 @@ export class Polling extends Transport {
    */
   onRequest(req: IncomingMessage & { res: ServerResponse }) {
     const res = req.res;
+    // remove the reference to the ServerResponse object (as the first request of the session is kept in memory by default)
+    req.res = null;
 
     if ("GET" === req.method) {
       this.onPollRequest(req, res);