diff --git a/lib/util/settings.js b/lib/util/settings.js
index ae9301ee3..db7f8b24d 100644
--- a/lib/util/settings.js
+++ b/lib/util/settings.js
@@ -1,4 +1,5 @@
 const data = require('./data');
+const utils = require('./utils');
 const file = data.joinPath('configuration.yaml');
 const objectAssignDeep = require(`object-assign-deep`);
 const path = require('path');
@@ -287,11 +288,13 @@ function write() {
 function validate() {
     const validate = ajv.compile(schema);
     const valid = validate(_settings);
+    const postfixes = utils.getPostfixes();
 
     // Verify that all friendly names are unique
     const names = [];
     const check = (name) => {
         if (names.includes(name)) throw new Error(`Duplicate friendly_name '${name}' found`);
+        if (postfixes.includes(name)) throw new Error(`Following friendly_name are not allowed: '${postfixes}'`);
         names.push(name);
     };
     Object.values(_settingsWithDefaults.devices).forEach((d) => check(d.friendly_name));
diff --git a/test/settings.test.js b/test/settings.test.js
index 12baf9828..688f36ac2 100644
--- a/test/settings.test.js
+++ b/test/settings.test.js
@@ -1,6 +1,7 @@
 require('./stub/logger');
 require('./stub/data');
 const data = require('../lib/util/data.js');
+const utils = require('../lib/util/utils.js');
 const settings = require('../lib/util/settings.js');
 const fs = require('fs');
 const configurationFile = data.joinPath('configuration.yaml');
@@ -511,6 +512,18 @@ describe('Settings', () => {
         }).toThrowError(`Duplicate friendly_name 'myname' found`);
     });
 
+    it('Configuration shouldnt be valid when friendly_name is a postfix', async () => {
+        write(configurationFile, {
+            devices: {'0x0017880104e45519': {friendly_name: 'left', retain: false}},
+        });
+
+        settings._reRead();
+
+        expect(() => {
+            settings.validate();
+        }).toThrowError(`Following friendly_name are not allowed: '${utils.getPostfixes()}'`);
+    });
+
     it('Configuration shouldnt be valid when duplicate friendly_name are used', async () => {
         write(configurationFile, {
             devices: {