diff --git a/src/manager.c b/src/manager.c
index f1aa59c7..5bedfcc5 100644
--- a/src/manager.c
+++ b/src/manager.c
@@ -894,8 +894,11 @@ static int manager_init(void)
 	}
 
 	if (!l_settings_get_bool(config, "General",
-				"UseDefaultInterface", &use_default))
+				"UseDefaultInterface", &use_default)) {
+		l_warn("[General].UseDefaultInterface is deprecated, please "
+			"use [DriverQuirks].DefaultInterface instead");
 		use_default = false;
+	}
 
 	return 0;