diff --git a/background.js b/background.js
index 3b0652f..0f8cfdf 100644
--- a/background.js
+++ b/background.js
@@ -216,7 +216,11 @@
       });
     } else {
       ga('send', 'event', 'Page Action', 'Switch to PolyGerrit');
+      var curYear = new Date().getFullYear();
+      var twoYearsFromNow =
+          Math.round(new Date().setFullYear(curYear + 2) / 1000);
       chrome.cookies.set({
+        expirationDate: twoYearsFromNow,
         url: tab.url,
         name: 'GERRIT_UI',
         value: 'polygerrit',