diff --git a/fhem/contrib/HMCCU/88_HMCCUCHN.pm b/fhem/contrib/HMCCU/88_HMCCUCHN.pm
index ac88c59b6..6d8593b62 100644
--- a/fhem/contrib/HMCCU/88_HMCCUCHN.pm
+++ b/fhem/contrib/HMCCU/88_HMCCUCHN.pm
@@ -39,6 +39,8 @@ use strict;
 use warnings;
 use SetExtensions;
 
+use Time::HiRes;
+
 sub HMCCUCHN_Define ($@);
 sub HMCCUCHN_Set ($@);
 sub HMCCUCHN_Get ($@);