diff --git a/js/csrfprotector.js b/js/csrfprotector.js
index ac58c55..5d1920c 100644
--- a/js/csrfprotector.js
+++ b/js/csrfprotector.js
@@ -44,7 +44,7 @@ var CSRFP = {
 	 * @return {String} auth key from cookie.
 	 */
 	_getAuthKey: function () {
-		var regex = new RegExp(`(?:^|;\s*)${CSRFP.CSRFP_TOKEN}=([^;]+)(;|$)`);
+		var regex = new RegExp(`(?:^|;\\s*)${CSRFP.CSRFP_TOKEN}=([^;]+)(;|$)`);
 		var regexResult = regex.exec(document.cookie);
 		if (regexResult === null) {
 			return null;