diff --git a/types/connect-mongo/index.d.ts b/types/connect-mongo/index.d.ts
index ea39a13f42..7173cb50dc 100644
--- a/types/connect-mongo/index.d.ts
+++ b/types/connect-mongo/index.d.ts
@@ -110,6 +110,7 @@ declare namespace connectMongo {
         length: (callback: (err: any, length: number) => void) => void;
         clear: (callback?: (err?: any) => void) => void;
         touch: (sid: string, session: Express.SessionData, callback?: (err: any) => void) => void;
+        close: () => void;
     }
 }