diff --git a/public/vendor/flot/jquery.flot.events.js b/public/vendor/flot/jquery.flot.events.js
index 48ebf2b67fd..6d8a0cf3c42 100644
--- a/public/vendor/flot/jquery.flot.events.js
+++ b/public/vendor/flot/jquery.flot.events.js
@@ -50,7 +50,7 @@
             height: 10
         };
 
-        var _events = [], _types, _eventsEnabled = false, lastRange;
+        var _events = [], _types, _eventsEnabled = false;
 
         plot.getEvents = function(){
             return _events;
@@ -94,8 +94,6 @@
                 // check for first run
                 if (_events.length < 1) {
 
-                    _lastRange = xaxis.max - xaxis.min;
-
                     // check for clustering
                     if (options.events.clustering) {
                         var ed = _clusterEvents(options.events.types, options.events.data, xaxis.max - xaxis.min);