diff --git a/CHANGELOG.md b/CHANGELOG.md
index 0c414c0f..c1d1f00b 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,6 +4,13 @@ All notable changes to this project will be documented in this file.
 This project adheres to [Semantic Versioning](http://semver.org/).
 
 ---
+
+## [2.5.1] - 2018-08-16
+
+### Fixed
+
+- Fix calendar parsing issue for Midori on RasperryPi Zero w, realted to issue #694.
+
 ## [2.5.0] - Unreleased
 
 *This release is scheduled to be released on 2018-10-01.*
diff --git a/modules/default/calendar/calendar.js b/modules/default/calendar/calendar.js
index 7a4c2206..ebfc4c14 100755
--- a/modules/default/calendar/calendar.js
+++ b/modules/default/calendar/calendar.js
@@ -440,7 +440,7 @@ Module.register("calendar", {
 
 
 	listContainsEvent: function(eventList, event){
-		for(let evt of eventList){
+		for(var evt of eventList){
 			if(evt.title === event.title && parseInt(evt.startDate) === parseInt(event.startDate)){
 				return true;
 			}