diff --git a/gtk2_ardour/io_plugin_window.cc b/gtk2_ardour/io_plugin_window.cc
index a435789216..0a1abc445b 100644
--- a/gtk2_ardour/io_plugin_window.cc
+++ b/gtk2_ardour/io_plugin_window.cc
@@ -16,8 +16,6 @@
  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  */
 
-#include <boost/shared_ptr.hpp>
-
 #include <gtkmm/frame.h>
 #include <gtkmm/label.h>
 #include <gtkmm/scrolledwindow.h>
diff --git a/libs/ardour/ardour/export_smf_writer.h b/libs/ardour/ardour/export_smf_writer.h
index 5c46f72bbd..9d86d1b832 100644
--- a/libs/ardour/ardour/export_smf_writer.h
+++ b/libs/ardour/ardour/export_smf_writer.h
@@ -19,8 +19,6 @@
 #ifndef _libardour_export_smf_writer_h_
 #define _libardour_export_smf_writer_h_
 
-#include <boost/shared_ptr.hpp>
-
 #include "evoral/SMF.h"
 
 #include "ardour/libardour_visibility.h"
diff --git a/libs/ardour/ardour/graph_edges.h b/libs/ardour/ardour/graph_edges.h
index 433e67fe79..98faf2ace0 100644
--- a/libs/ardour/ardour/graph_edges.h
+++ b/libs/ardour/ardour/graph_edges.h
@@ -22,8 +22,6 @@
 #include <map>
 #include <set>
 
-#include <boost/shared_ptr.hpp>
-
 #include "ardour/libardour_visibility.h"
 #include "ardour/types.h"
 
diff --git a/libs/ardour/ardour/mixer_scene.h b/libs/ardour/ardour/mixer_scene.h
index 8a6d866dbc..d152e0af6d 100644
--- a/libs/ardour/ardour/mixer_scene.h
+++ b/libs/ardour/ardour/mixer_scene.h
@@ -19,8 +19,6 @@
 #ifndef _libardour_mixer_scene_h_
 #define _libardour_mixer_scene_h_
 
-#include <boost/shared_ptr.hpp>
-
 #include "pbd/stateful.h"
 
 #include "ardour/libardour_visibility.h"