diff --git a/libs/ardour/ardour/ardour.h b/libs/ardour/ardour/ardour.h
index 31565336d4..8be99a4aba 100644
--- a/libs/ardour/ardour/ardour.h
+++ b/libs/ardour/ardour/ardour.h
@@ -38,10 +38,6 @@
 #include "ardour/types.h"
 #include "ardour/libardour_visibility.h"
 
-namespace PBD {
-	class FPU;
-}
-
 namespace MIDI {
 	class MachineControl;
 	class Port;