diff --git a/src/TokenCache.ts b/src/TokenCache.ts
index 85f7ac3..ee757f1 100644
--- a/src/TokenCache.ts
+++ b/src/TokenCache.ts
@@ -52,7 +52,7 @@ export class TokenCache {
     public isExpiring(session: Session): [boolean, number] {
         const decodedJwt: Jwt = jwtDecode(session.AccessToken);
 
-        const timeLeft: number = decodedJwt['exp']; - Math.floor(Date.now() / 1000);
+        const timeLeft: number = decodedJwt['exp'] - Math.floor(Date.now() / 1000);
 
         if (timeLeft < (5 * 60)) {
             return [true, 0];
diff --git a/src/destreamer.ts b/src/destreamer.ts
index 9f5f174..6db3135 100644
--- a/src/destreamer.ts
+++ b/src/destreamer.ts
@@ -195,7 +195,8 @@ async function downloadVideo(videoGUIDs: Array<string>,
             continue;
         }
 
-        if (argv.keepLoginCookies && tokenCache.isExpiring(session)) {
+        const [isSessionExpiring] = tokenCache.isExpiring(session);
+        if (argv.keepLoginCookies && isSessionExpiring) {
             logger.info('Trying to refresh access token...');
             session = await refreshSession('https://web.microsoftstream.com/');
             apiClient.setSession(session);