diff --git a/gtk2_ardour/note.h b/gtk2_ardour/note.h
index e763ea95f8..37d5573fa1 100644
--- a/gtk2_ardour/note.h
+++ b/gtk2_ardour/note.h
@@ -51,8 +51,8 @@ public:
 	void set_x1 (ArdourCanvas::Coord);
 	void set_y1 (ArdourCanvas::Coord);
 
-        void set_outline_what (ArdourCanvas::Rectangle::What);
-        void set_outline_all ();
+	void set_outline_what (ArdourCanvas::Rectangle::What);
+	void set_outline_all ();
 
 	void set_outline_color (uint32_t);
 	void set_fill_color (uint32_t);