diff --git a/77_UWZ.pm b/77_UWZ.pm
index 87ab3e2..d5322fe 100644
--- a/77_UWZ.pm
+++ b/77_UWZ.pm
@@ -44,6 +44,7 @@ package FHEM::UWZ;
 use strict;
 use feature qw/say switch/;
 use warnings;
+use POSIX;
 use GPUtils qw(GP_Import GP_Export);
 use FHEM::Meta;
 use Data::Dumper;    # Debug only