diff --git a/libs/pbd/pbd/command.h b/libs/pbd/pbd/command.h
index 8e85e28882..7af7f7bb98 100644
--- a/libs/pbd/pbd/command.h
+++ b/libs/pbd/pbd/command.h
@@ -38,7 +38,7 @@ public:
 	virtual void redo() { (*this)(); }
 	
 	virtual XMLNode &get_state();
-	virtual int set_state(const XMLNode&, int version) { /* noop */ return 0; }
+	virtual int set_state(const XMLNode&, int /*version*/) { /* noop */ return 0; }
 
 protected:
 	Command() {}