diff --git a/libs/surfaces/osc/osc_cue_observer.cc b/libs/surfaces/osc/osc_cue_observer.cc
index 0774f3c70f..1d062571ae 100644
--- a/libs/surfaces/osc/osc_cue_observer.cc
+++ b/libs/surfaces/osc/osc_cue_observer.cc
@@ -17,8 +17,6 @@
  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  */
 
-#include "boost/lambda/lambda.hpp"
-
 #include "pbd/control_math.h"
 
 #include "ardour/track.h"
diff --git a/libs/surfaces/osc/osc_global_observer.cc b/libs/surfaces/osc/osc_global_observer.cc
index 7b6f82481d..dd3e3dc79a 100644
--- a/libs/surfaces/osc/osc_global_observer.cc
+++ b/libs/surfaces/osc/osc_global_observer.cc
@@ -17,8 +17,6 @@
  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  */
 
-#include "boost/lambda/lambda.hpp"
-
 #include "pbd/control_math.h"
 
 #include "ardour/amp.h"
diff --git a/libs/surfaces/osc/osc_route_observer.cc b/libs/surfaces/osc/osc_route_observer.cc
index 39b595790f..27944b8332 100644
--- a/libs/surfaces/osc/osc_route_observer.cc
+++ b/libs/surfaces/osc/osc_route_observer.cc
@@ -19,8 +19,6 @@
  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  */
 
-#include "boost/lambda/lambda.hpp"
-
 #include "pbd/control_math.h"
 #include <glibmm.h>
 
diff --git a/libs/surfaces/osc/osc_select_observer.cc b/libs/surfaces/osc/osc_select_observer.cc
index b7eec337ae..a038540265 100644
--- a/libs/surfaces/osc/osc_select_observer.cc
+++ b/libs/surfaces/osc/osc_select_observer.cc
@@ -19,8 +19,6 @@
  */
 
 #include <vector>
-#include "boost/lambda/lambda.hpp"
-
 #include "pbd/control_math.h"
 
 #include "ardour/session.h"