diff --git a/src/lib/plugins/tick.js b/src/lib/plugins/tick.js
index c83018c..0094792 100644
--- a/src/lib/plugins/tick.js
+++ b/src/lib/plugins/tick.js
@@ -8,10 +8,11 @@ module.exports.server=function(serv) {
 
     serv.tickInterval = setInterval(() => {
       serv.tickCount++;
-      var time = (Date.now() - serv.lastTickTime) / 1000;
+      var t=Date.now();
+      var time = (t - serv.lastTickTime) / 1000;
       if (time > 100) time = 0;
       serv.emit('tick', time, serv.tickCount);
-      serv.lastTickTime = Date.now();
+      serv.lastTickTime = t;
     }, 1000/ticksPerSecond);
   };