diff --git a/app/src/main/java/com/nextcloud/talk/webrtc/MagicWebSocketInstance.java b/app/src/main/java/com/nextcloud/talk/webrtc/MagicWebSocketInstance.java
index eab0c6cdb..4dd49f69b 100644
--- a/app/src/main/java/com/nextcloud/talk/webrtc/MagicWebSocketInstance.java
+++ b/app/src/main/java/com/nextcloud/talk/webrtc/MagicWebSocketInstance.java
@@ -152,7 +152,7 @@ public class MagicWebSocketInstance extends WebSocketListener {
         resumeId = "";
     }
 
-    public void restartWebSocket() {
+    public final void restartWebSocket() {
         reconnecting = true;
 
         // TODO when improving logging, keep in mind this issue: https://github.com/nextcloud/talk-android/issues/1013
diff --git a/app/src/main/java/com/nextcloud/talk/webrtc/WebRtcAudioManager.java b/app/src/main/java/com/nextcloud/talk/webrtc/WebRtcAudioManager.java
index f7e36034e..a3cf70773 100644
--- a/app/src/main/java/com/nextcloud/talk/webrtc/WebRtcAudioManager.java
+++ b/app/src/main/java/com/nextcloud/talk/webrtc/WebRtcAudioManager.java
@@ -399,7 +399,7 @@ public class WebRtcAudioManager {
         return false;
     }
 
-    public void updateAudioDeviceState() {
+    public final void updateAudioDeviceState() {
         ThreadUtils.checkIsOnMainThread();
         Log.d(TAG, "--- updateAudioDeviceState: "
             + "wired headset=" + hasWiredHeadset + ", "
diff --git a/app/src/main/java/com/nextcloud/talk/webrtc/WebRtcBluetoothManager.java b/app/src/main/java/com/nextcloud/talk/webrtc/WebRtcBluetoothManager.java
index 65e115af9..ba530f1c3 100644
--- a/app/src/main/java/com/nextcloud/talk/webrtc/WebRtcBluetoothManager.java
+++ b/app/src/main/java/com/nextcloud/talk/webrtc/WebRtcBluetoothManager.java
@@ -295,7 +295,7 @@ public class WebRtcBluetoothManager {
     /**
      * Stubs for test mocks.
      */
-    protected AudioManager getAudioManager(Context context) {
+    protected final AudioManager getAudioManager(Context context) {
         return (AudioManager) context.getSystemService(Context.AUDIO_SERVICE);
     }