diff --git a/libs/ardour/ardour/processor.h b/libs/ardour/ardour/processor.h
index 745702e0c1..33fc813eec 100644
--- a/libs/ardour/ardour/processor.h
+++ b/libs/ardour/ardour/processor.h
@@ -44,7 +44,6 @@ namespace ARDOUR {
 
 class Location;
 class Session;
-class Route;
 
 /** A mixer strip element - plugin, send, meter, etc */
 class LIBARDOUR_API Processor : public SessionObject, public Automatable, public Latent