diff --git a/libs/ardour/ardour/monitor_control.h b/libs/ardour/ardour/monitor_control.h
index e6a7a1d42d..151bcc2225 100644
--- a/libs/ardour/ardour/monitor_control.h
+++ b/libs/ardour/ardour/monitor_control.h
@@ -22,8 +22,6 @@
 #include <memory>
 #include <string>
 
-#include <boost/dynamic_bitset.hpp>
-
 #include "ardour/slavable_automation_control.h"
 #include "ardour/monitorable.h"
 
diff --git a/libs/ardour/ardour/record_enable_control.h b/libs/ardour/ardour/record_enable_control.h
index 8a79667610..3e64cdbc4e 100644
--- a/libs/ardour/ardour/record_enable_control.h
+++ b/libs/ardour/ardour/record_enable_control.h
@@ -22,8 +22,6 @@
 #include <memory>
 #include <string>
 
-#include <boost/dynamic_bitset.hpp>
-
 #include "ardour/slavable_automation_control.h"
 #include "ardour/recordable.h"