diff --git a/package-lock.json b/package-lock.json
index 0d1120c..9592748 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,12 +1,12 @@
 {
   "name": "mrterm",
-  "version": "0.18.0",
+  "version": "0.18.1",
   "lockfileVersion": 3,
   "requires": true,
   "packages": {
     "": {
       "name": "mrterm",
-      "version": "0.18.0",
+      "version": "0.18.1",
       "license": "MIT",
       "dependencies": {
         "@xterm/addon-fit": "^0.11.0",
diff --git a/package.json b/package.json
index c3563b4..b3e4c4e 100644
--- a/package.json
+++ b/package.json
@@ -1,7 +1,7 @@
 {
   "name": "mrterm",
   "productName": "MrTerm",
-  "version": "0.18.0",
+  "version": "0.18.1",
   "description": "Moderner SSH-, SFTP- und RDP-Client",
   "main": "src/main/main.js",
   "author": "MrBlake",
@@ -53,6 +53,7 @@
     "directories": {
       "buildResources": "build"
     },
+    "beforePack": "scripts/ensure-koffi.js",
     "asarUnpack": [
       "node_modules/koffi/**",
       "node_modules/@koromix/**"
diff --git a/scripts/ensure-koffi.js b/scripts/ensure-koffi.js
new file mode 100644
index 0000000..0f7a83b
--- /dev/null
+++ b/scripts/ensure-koffi.js
@@ -0,0 +1,19 @@
+// electron-builder beforePack: stellt sicher, dass die native koffi-Binary der Zielplattform in node_modules liegt.
+// npm installiert nur die Binary der Build-Plattform – beim Cross-Build (z. B. Windows-Paket auf Linux) fehlt sie sonst,
+// und RDP im Tab fällt mit "koffi nicht verfügbar" auf ein externes Fenster zurück.
+const fs = require('fs');
+const path = require('path');
+const { execSync } = require('child_process');
+const { Arch } = require('electron-builder');
+
+module.exports = async (context) => {
+  const platform = context.electronPlatformName;
+  const arch = Arch[context.arch];
+  const pkg = `@koromix/koffi-${platform}-${arch}`;
+  const root = path.join(__dirname, '..');
+  if (fs.existsSync(path.join(root, 'node_modules', pkg))) return;
+  const { version } = require(path.join(root, 'node_modules', 'koffi', 'package.json'));
+  console.log(`  • koffi-Binary für ${platform}-${arch} fehlt – installiere ${pkg}@${version}`);
+  execSync(`npm install --no-save --force ${pkg}@${version}`, { cwd: root, stdio: 'inherit' });
+  if (!fs.existsSync(path.join(root, 'node_modules', pkg))) throw new Error(`${pkg} konnte nicht installiert werden`);
+};