diff --git a/scripts/install b/scripts/install
index d58f7cc..9fc51f5 100644
--- a/scripts/install
+++ b/scripts/install
@@ -98,7 +98,7 @@ case "$node_type" in
     server) systemd_user="$app" ;;
 esac
 ynh_add_systemd_config
-yunohost service add "$app" --log="/var/log/$app/$app.log" --needs_exposed_ports="$port_rpc $port_serf"
+yunohost service add "$app" --log="/var/log/$app/$app.log" --needs_exposed_ports "$port_rpc" "$port_serf"
 
 # Use logrotate to manage application logfile(s)
 ynh_use_logrotate
diff --git a/scripts/restore b/scripts/restore
index d51786e..b333ebb 100644
--- a/scripts/restore
+++ b/scripts/restore
@@ -65,7 +65,7 @@ ynh_restore_file --origin_path="/etc/nginx/conf.d/$domain.d/$app.conf"
 
 ynh_restore_file --origin_path="/etc/systemd/system/$app.service"
 systemctl enable "$app.service" --quiet
-yunohost service add "$app" --log="/var/log/$app/$app.log" --needs_exposed_ports="$port_rpc $port_serf"
+yunohost service add "$app" --log="/var/log/$app/$app.log" --needs_exposed_ports "$port_rpc" "$port_serf"
 
 ynh_restore_file --origin_path="/etc/logrotate.d/$app"
 
diff --git a/scripts/upgrade b/scripts/upgrade
index 7071489..37e87be 100644
--- a/scripts/upgrade
+++ b/scripts/upgrade
@@ -81,7 +81,7 @@ case "$node_type" in
     server) systemd_user="$app" ;;
 esac
 ynh_add_systemd_config
-yunohost service add "$app" --log="/var/log/$app/$app.log" --needs_exposed_ports="$port_rpc $port_serf"
+yunohost service add "$app" --log="/var/log/$app/$app.log" --needs_exposed_ports "$port_rpc" "$port_serf"
 
 # Use logrotate to manage app-specific logfile(s)
 ynh_use_logrotate --non-append