diff --git a/version.js b/version.js
index 7d3eb2f6..82b125c7 100644
--- a/version.js
+++ b/version.js
@@ -1,2 +1,6 @@
 // downloaded from repository by verifyVersion()
-cookie('adminer_version=2.3.0', 7); // last released version, valid for 7 days
+(function () { // cookie function is not defined in older versions
+	var date = new Date();
+	date.setDate(date.getDate() + 7); // valid for 7 days
+	document.cookie = 'adminer_version=2.3.0; expires=' + date; // last released version
+})();