diff --git a/linux_voice_assistant/models.py b/linux_voice_assistant/models.py
index 4ca4f9e..1542135 100644
--- a/linux_voice_assistant/models.py
+++ b/linux_voice_assistant/models.py
@@ -70,6 +70,7 @@ class ServerState:
     music_player: "MpvMediaPlayer"
     tts_player: "MpvMediaPlayer"
     wakeup_sound: str
+    processing_sound: str
     timer_finished_sound: str
     preferences: Preferences
     preferences_path: Path