diff --git a/out/session.js b/out/session.js
index 1094ae5..d90b2e9 100644
--- a/out/session.js
+++ b/out/session.js
@@ -30,7 +30,7 @@ function getRouter(options) {
             const sessionStore = req.sessionStore;
             if (sessionStore) {
                 const getSession = util_1.promisify(sessionStore.get);
-                const session = yield getSession(sessionId);
+                const session = yield getSession.call(sessionStore, sessionId);
                 if (session) {
                     sessionStore.createSession(req, session);
                     return true; // success
diff --git a/src/session.ts b/src/session.ts
index 32b2e61..12a2259 100644
--- a/src/session.ts
+++ b/src/session.ts
@@ -29,7 +29,7 @@ function getRouter(options?: Partial<session.SessionOptions>): RequestHandler {
 			const sessionStore = (req as { sessionStore?: session.Store }).sessionStore;
 			if (sessionStore) {
 				const getSession = promisify(sessionStore.get);
-				const session = await getSession(sessionId);
+				const session = await getSession.call(sessionStore, sessionId);
 				if (session) {
 					sessionStore.createSession(req, session);
 					return true; // success