diff --git a/scripts/freqtrade-lxc-install.sh b/scripts/freqtrade-lxc-install.sh
index ed9440e..60c0bd8 100644
--- a/scripts/freqtrade-lxc-install.sh
+++ b/scripts/freqtrade-lxc-install.sh
@@ -196,9 +196,9 @@ create_lxc() {
   info "Warte auf Netzwerk..."
   local tries=0
   until pct exec "$CT_ID" -- bash -c "ip route | grep -q default" 2>/dev/null; do
-    sleep 3; ((tries++))
-    [[ $tries -ge 20 ]] && error "Netzwerk nicht erreichbar – Bridge/IP prüfen!"
+    sleep 3; tries=$((tries+1))
     echo -n "."
+    [[ $tries -ge 20 ]] && error "Netzwerk nicht erreichbar – Bridge/IP prüfen!"
   done
   echo
   success "Container läuft und hat Netzwerk"
diff --git a/scripts/install-vpn.sh b/scripts/install-vpn.sh
index e39c379..31bba14 100644
--- a/scripts/install-vpn.sh
+++ b/scripts/install-vpn.sh
@@ -228,7 +228,7 @@ start_and_verify() {
   while [[ $tries -lt 18 ]]; do
     sleep 5; echo -n "."
     docker exec gluetun wget -qO- https://ipinfo.io/ip &>/dev/null && { vpn_ok=true; break; }
-    ((tries++))
+    tries=$((tries+1))
   done
   echo