diff --git a/src/session/mod.ts b/src/session/mod.ts
index dfd1f43..17c6b59 100644
--- a/src/session/mod.ts
+++ b/src/session/mod.ts
@@ -11,7 +11,7 @@ export class SessionStore {
 
 	static get maxAge() {
 		const halfHour = 30 * 60 * 1_000
-		return Date.now() - halfHour
+		return Date.now() + halfHour
 	}
 	static createSession(): Session {
 		return new Session(this.#store)
@@ -19,13 +19,15 @@ export class SessionStore {
 
 	static getSession(uuid: string): Session | undefined {
 		// Check session validity
+		const halfHour = 30 * 60 * 1_000
+		const maxOld = Date.now() - halfHour
 		const session = this.#store.get(uuid)
 
 		if (session === undefined) {
 			return undefined
 		}
 
-		if (session.timestamp < this.maxAge) {
+		if (session.timestamp < maxOld) {
 			session.destroy()
 			return undefined
 		}