diff --git a/server/lib/prosody/config.ts b/server/lib/prosody/config.ts
index 96d60bdf..35f44fd0 100644
--- a/server/lib/prosody/config.ts
+++ b/server/lib/prosody/config.ts
@@ -78,10 +78,6 @@ async function getProsodyConfig (options: RegisterServerOptions): Promise<Prosod
     throw new Error('Invalid port')
   }
   const enableC2s = (await options.settingsManager.getSetting('prosody-c2s') as boolean) || false
-  const c2sPort = (await options.settingsManager.getSetting('prosody-c2s-port') as string) || '52822'
-  if (!/^\d+$/.test(c2sPort)) {
-    throw new Error('Invalid c2s port')
-  }
   const prosodyDomain = await getProsodyDomain(options)
   const paths = await getProsodyFilePaths(options)
 
@@ -101,9 +97,17 @@ async function getProsodyConfig (options: RegisterServerOptions): Promise<Prosod
 
   const config = new ProsodyConfigContent(paths, prosodyDomain)
   config.useHttpAuthentication(authApiUrl)
-  config.usePeertubeBosh(prosodyDomain, port, enableC2s, c2sPort)
+  config.usePeertubeBosh(prosodyDomain, port)
   config.useMucHttpDefault(roomApiUrl)
 
+  if (enableC2s) {
+    const c2sPort = (await options.settingsManager.getSetting('prosody-c2s-port') as string) || '52822'
+    if (!/^\d+$/.test(c2sPort)) {
+      throw new Error('Invalid c2s port')
+    }
+    config.useC2S(c2sPort)
+  }
+
   // TODO: add a settings so that admin can choose? (on/off and duration)
   config.useMam('1w') // Remove archived messages after 1 week
   // TODO: add a settings to choose?
diff --git a/server/lib/prosody/config/content.ts b/server/lib/prosody/config/content.ts
index 959bb3ac..57cc04bc 100644
--- a/server/lib/prosody/config/content.ts
+++ b/server/lib/prosody/config/content.ts
@@ -168,14 +168,10 @@ class ProsodyConfigContent {
     this.authenticated.set('http_auth_url', url)
   }
 
-  usePeertubeBosh (prosodyDomain: string, port: string, enableC2s: boolean, c2sPort: string): void {
+  usePeertubeBosh (prosodyDomain: string, port: string): void {
     this.global.set('c2s_require_encryption', false)
     this.global.set('interfaces', ['127.0.0.1', '::1'])
-    if (enableC2s) {
-      this.global.set('c2s_ports', [c2sPort])
-    } else {
-      this.global.set('c2s_ports', [])
-    }
+    this.global.set('c2s_ports', [])
     this.global.set('c2s_interfaces', ['127.0.0.1', '::1'])
     this.global.set('s2s_ports', [])
     this.global.set('s2s_interfaces', ['127.0.0.1', '::1'])
@@ -205,6 +201,10 @@ class ProsodyConfigContent {
     }
   }
 
+  useC2S (c2sPort: string): void {
+    this.global.set('c2s_ports', [c2sPort])
+  }
+
   useMucHttpDefault (url: string): void {
     this.muc.add('modules_enabled', 'muc_http_defaults')
     this.muc.add('muc_create_api_url', url)