diff --git a/libs/ardour/audio_diskstream.cc b/libs/ardour/audio_diskstream.cc
index cd76e53100..22be5a3912 100644
--- a/libs/ardour/audio_diskstream.cc
+++ b/libs/ardour/audio_diskstream.cc
@@ -31,7 +31,6 @@
 #include <sys/mman.h>
 
 #include "pbd/error.h"
-#include <glibmm/thread.h>
 #include "pbd/xml++.h"
 #include "pbd/memento_command.h"
 #include "pbd/enumwriter.h"