diff --git a/libs/ardour/ardour/types.h b/libs/ardour/ardour/types.h
index f8910715a0..06e06d0196 100644
--- a/libs/ardour/ardour/types.h
+++ b/libs/ardour/ardour/types.h
@@ -463,7 +463,7 @@ enum MonitorChoice {
 };
 
 enum MonitorState {
-	MonitoringSilence = 0x1,
+	MonitoringSilence = 0x0,
 	MonitoringInput = 0x2,
 	MonitoringDisk = 0x4,
 	MonitoringCue = 0x6,
diff --git a/libs/ardour/route.cc b/libs/ardour/route.cc
index 3eac521d7e..cebed69f82 100644
--- a/libs/ardour/route.cc
+++ b/libs/ardour/route.cc
@@ -6152,10 +6152,10 @@ Route::monitoring_state () const
 
 	if (m != MonitorAuto) {
 
-		MonitorState ms ((MonitorState) 0);
+		MonitorState ms = MonitoringSilence;
 
 		if (m & MonitorInput) {
-			ms = MonitoringInput;
+			ms = MonitorState (ms | MonitoringInput);
 		}
 
 		if (m & MonitorDisk) {