diff --git a/addnew_printer.sh b/addnew_printer.sh
index 98a6a70..9da80cc 100755
--- a/addnew_printer.sh
+++ b/addnew_printer.sh
@@ -105,7 +105,7 @@ then
    #journalctl --rotate > /dev/null 2>&1
    #journalctl --vacuum-time=1seconds > /dev/null 2>&1
    #just to be on the safe side, add user to dialout
-   usermod -a G dialout $OCTOUSER
+   usermod -a -G dialout $OCTOUSER
    #Open port to be on safe side
    ufw allow $PORT/tcp