1 files changed, 6 insertions, 3 deletions
diff --git a/libs/surfaces/mackie/gui.h b/libs/surfaces/mackie/gui.h
index 42ee338f99..6fc0352b65 100644
--- a/libs/surfaces/mackie/gui.h
+++ b/libs/surfaces/mackie/gui.h
@@ -16,7 +16,6 @@
   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */
 
-
 #include <gtkmm/comboboxtext.h>
 #include <gtkmm/box.h>
 #include <gtkmm/spinbutton.h>
@@ -30,12 +29,14 @@ namespace Gtk {
 	class CellRendererCombo;
 }
 
-class MackieControlProtocol;
-
 #include "button.h"
 
 #include "i18n.h"
 
+namespace ArdourSurface {
+
+class MackieControlProtocol;
+
 class MackieControlProtocolGUI : public Gtk::Notebook
 {
   public:
@@ -110,3 +111,5 @@ class MackieControlProtocolGUI : public Gtk::Notebook
     void discover_clicked ();
 };
 
+}
+