diff --git a/js/toggle.js b/js/toggle.js
index 08ecb86..4a631ee 100644
--- a/js/toggle.js
+++ b/js/toggle.js
@@ -16,7 +16,7 @@ if (!document.cookie.includes('preference')) {
 function setPreference(value) {
     if (typeof value === 'boolean') {
         const expires = new Date();
-        expires.setTime(expires.getTime() + 1000 * 60 * 60); // 1 hour
+        expires.setFullYear(expires.getFullYear() + 1); // 1 year
         document.cookie = `preference=${value};expires=${expires.toUTCString()};path=/`;
         turnLight();
     }