diff --git a/libs/ardour/ardour/audioengine.h b/libs/ardour/ardour/audioengine.h
index 11a37d85ec..872286044b 100644
--- a/libs/ardour/ardour/audioengine.h
+++ b/libs/ardour/ardour/audioengine.h
@@ -36,10 +36,12 @@
 #include "pbd/rcu.h"
 #include "pbd/signals.h"
 
-#include "ardour/ardour.h"
 #include <jack/weakjack.h>
 #include <jack/jack.h>
 #include <jack/transport.h>
+#include <jack/thread.h>
+
+#include "ardour/ardour.h"
 
 #include "ardour/data_type.h"
 #include "ardour/session_handle.h"
diff --git a/libs/ardour/audioengine.cc b/libs/ardour/audioengine.cc
index ea193ff6e2..00877f14c6 100644
--- a/libs/ardour/audioengine.cc
+++ b/libs/ardour/audioengine.cc
@@ -31,6 +31,8 @@
 #include "pbd/unknown_type.h"
 #include "pbd/epa.h"
 
+#include <jack/weakjack.h>
+
 #include "midi++/port.h"
 #include "midi++/mmc.h"
 #include "midi++/manager.h"