diff --git a/libs/ardour/ardour/types.h b/libs/ardour/ardour/types.h
index 7e3a5683f9..baf520ff8a 100644
--- a/libs/ardour/ardour/types.h
+++ b/libs/ardour/ardour/types.h
@@ -721,7 +721,8 @@ struct RouteProcessorChange {
 		MeterPointChange = 0x1,
 		RealTimeChange   = 0x2,
 		GeneralChange    = 0x4,
-		SendReturnChange = 0x8
+		SendReturnChange = 0x8,
+		CustomPinChange  = 0x10
 	};
 
 	RouteProcessorChange () : type (GeneralChange), meter_visibly_changed (true)
diff --git a/libs/ardour/route.cc b/libs/ardour/route.cc
index be1db1416a..fd9bfd3455 100644
--- a/libs/ardour/route.cc
+++ b/libs/ardour/route.cc
@@ -2488,7 +2488,7 @@ Route::customize_plugin_insert (std::shared_ptr<Processor> proc, uint32_t count,
 		configure_processors_unlocked (0, &lm);
 	}
 
-	processors_changed (RouteProcessorChange ()); /* EMIT SIGNAL */
+	processors_changed (RouteProcessorChange (RouteProcessorChange::CustomPinChange, false)); /* EMIT SIGNAL */
 	_session.set_dirty ();
 	return true;
 }
@@ -2526,7 +2526,7 @@ Route::set_strict_io (const bool enable)
 		configure_processors (0);
 		lx.release ();
 
-		processors_changed (RouteProcessorChange ()); /* EMIT SIGNAL */
+		processors_changed (RouteProcessorChange (RouteProcessorChange::CustomPinChange, false)); /* EMIT SIGNAL */
 		_session.set_dirty ();
 	}
 	return true;