diff --git a/packages/astro/src/core/session.ts b/packages/astro/src/core/session.ts
index 9ac7327c59e2..33117a47a0e2 100644
--- a/packages/astro/src/core/session.ts
+++ b/packages/astro/src/core/session.ts
@@ -182,9 +182,8 @@ export class AstroSession<TDriver extends SessionDriverName = any> {
 		const oldSessionId = this.#sessionID;
 
 		// Create new session
-		this.#sessionID = undefined;
+		this.#sessionID = crypto.randomUUID();
 		this.#data = data;
-		this.#ensureSessionID();
 		await this.#setCookie();
 
 		// Clean up old session asynchronously