diff --git a/fhem/contrib/DS_Starter/98_SMAUtils.pm b/fhem/contrib/DS_Starter/98_SMAUtils.pm
index 80de32ef4..e800aade5 100644
--- a/fhem/contrib/DS_Starter/98_SMAUtils.pm
+++ b/fhem/contrib/DS_Starter/98_SMAUtils.pm
@@ -27,6 +27,7 @@ package main;
 use strict;
 use warnings;
 use MIME::Base64;
+use Blocking;
 
 
 sub