diff --git a/package/debian/matemat/DEBIAN/postinst b/package/debian/matemat/DEBIAN/postinst
index ceeed0c..305e6de 100755
--- a/package/debian/matemat/DEBIAN/postinst
+++ b/package/debian/matemat/DEBIAN/postinst
@@ -5,12 +5,11 @@ set -e
 if [[ "$1" == "configure" ]]; then
 
     if ! getent group matemat >/dev/null; then
-        addgroup --quiet --system matemat
+        groupadd --system matemat
     fi
 
     if ! getent passwd matemat >/dev/null; then
-        adduser --quiet --system --create-home --ingroup matemat --home /var/lib/matemat --shell /usr/sbin/nologin \
-            matemat
+        useradd --system --create-home --gid matemat --home-dir /var/lib/matemat --shell /usr/sbin/nologin matemat
     fi
 
     chown matemat:matemat -R /var/lib/matemat