diff --git a/libs/ardour/route.cc b/libs/ardour/route.cc
index c6c68cfb56..5d03832a74 100644
--- a/libs/ardour/route.cc
+++ b/libs/ardour/route.cc
@@ -6374,7 +6374,9 @@ Route::set_disk_io_point (DiskIOPoint diop)
 		configure_processors (0);
 	}
 
-	processors_changed (RouteProcessorChange ()); /* EMIT SIGNAL */
+	if (changed) {
+		processors_changed (RouteProcessorChange ()); /* EMIT SIGNAL */
+	}
 }
 
 void