diff --git a/libs/surfaces/push2/track_mix.cc b/libs/surfaces/push2/track_mix.cc
index 8c03f232cf..afb3aee768 100644
--- a/libs/surfaces/push2/track_mix.cc
+++ b/libs/surfaces/push2/track_mix.cc
@@ -428,6 +428,8 @@ TrackMixLayout::monitoring_change ()
 		b1_color = selection_color;
 		b2_color = selection_color;
 		break;
+	default:
+		return; /* stupid compilers */
 	}
 
 	b1->set_color (b1_color);