diff --git a/fhem/contrib/DEBIAN/postinst b/fhem/contrib/DEBIAN/postinst
index 5d6d37227..d0fc93c3b 100644
--- a/fhem/contrib/DEBIAN/postinst
+++ b/fhem/contrib/DEBIAN/postinst
@@ -3,10 +3,10 @@
 set -e
 
 if ! getent passwd fhem >/dev/null; then
-    useradd --system --home /var/log/fhem --shell /bin/false fhem
+    useradd --system --home /var/log/fhem --gid dialout --shell /bin/false fhem
 fi
 
-chown -R fhem /var/log/fhem /etc/fhem.cfg
+chown -R fhem /var/log/fhem /etc/fhem.cfg /usr/share/fhem
 
 #set up of autostart
 if test -x /sbin/initctl; then