diff --git a/fhem/contrib/DEBIAN/postinst b/fhem/contrib/DEBIAN/postinst
index 12ec2ccbe..b9eaeb347 100644
--- a/fhem/contrib/DEBIAN/postinst
+++ b/fhem/contrib/DEBIAN/postinst
@@ -7,7 +7,7 @@ if ! getent passwd fhem >/dev/null; then
     useradd --system --home /opt/fhem --gid dialout --shell /bin/false fhem
 fi
 
-chown -R fhem /opt/fhem
+chown -R fhem:root /opt/fhem
 
 # set up of autostart
 # Sysvinit; upstart no longer supported