diff --git a/fhem/FHEM/73_ElectricityCalculator.pm b/fhem/FHEM/73_ElectricityCalculator.pm
index 2da18146f..4fa972ca7 100644
--- a/fhem/FHEM/73_ElectricityCalculator.pm
+++ b/fhem/FHEM/73_ElectricityCalculator.pm
@@ -44,6 +44,7 @@
 package main;
 use strict;
 use warnings;
+use Time::Local;
 use FHEM::Meta;
 
 ###START###### Initialize module ##############################################################################START####