diff --git a/src/datasource-zabbix/dataProcessor.js b/src/datasource-zabbix/dataProcessor.js
index e6e0e6f..8081f58 100644
--- a/src/datasource-zabbix/dataProcessor.js
+++ b/src/datasource-zabbix/dataProcessor.js
@@ -9,7 +9,7 @@ let sumSeries = ts.sumSeries;
 let delta = ts.delta;
 let rate = ts.rate;
 let scale = (factor, datapoints) => ts.scale_perf(datapoints, factor);
-let offset = (factor, datapoints) => ts.offset(datapoints, delta);
+let offset = (delta, datapoints) => ts.offset(datapoints, delta);
 let simpleMovingAverage = (n, datapoints) => ts.simpleMovingAverage(datapoints, n);
 let expMovingAverage = (a, datapoints) => ts.expMovingAverage(datapoints, a);