diff --git a/app.py b/app.py
index a0fc35b..a1f9cfa 100644
--- a/app.py
+++ b/app.py
@@ -51,6 +51,8 @@ def _apply_startup_display_defaults():
         settings.setValue("display/auto_brightness", False)
     if not settings.contains("display/theme"):
         settings.setValue("display/theme", "night")
+    if not settings.contains("source/default_mode"):
+        settings.setValue("source/default_mode", "bluetooth")
 
 
 def _apply_reset_if_requested():