diff --git a/fhem/FHEM/11_OWDevice.pm b/fhem/FHEM/11_OWDevice.pm
index 4b183fe46..f6b675a27 100644
--- a/fhem/FHEM/11_OWDevice.pm
+++ b/fhem/FHEM/11_OWDevice.pm
@@ -27,9 +27,12 @@ package main;
 
 use strict;
 use warnings;
+no if $] >= 5.017011, warnings => 'experimental::smartmatch';
 
 use vars qw(%owdevice);
 
+
+
 # 1-Wire devices (order by family code)
 # http://owfs.sourceforge.net/family.html