diff --git a/libs/ardour/audioengine.cc b/libs/ardour/audioengine.cc
index b48df17fb9..3d9ef510d0 100644
--- a/libs/ardour/audioengine.cc
+++ b/libs/ardour/audioengine.cc
@@ -41,6 +41,9 @@
 #include "pbd/pthread_utils.h"
 #include "pbd/unknown_type.h"
 
+#include "temporal/superclock.h"
+#include "temporal/tempo.h"
+
 #include "midi++/port.h"
 #include "midi++/mmc.h"
 
@@ -1426,6 +1429,9 @@ AudioEngine::thread_init_callback (void* arg)
 	PBD::notify_event_loops_about_thread_creation (pthread_self(), thread_name, 4096);
 	AsyncMIDIPort::set_process_thread (pthread_self());
 
+	Temporal::_thread_sample_rate = 44100; /* will change later as appropriate */
+	Temporal::TempoMap::fetch ();
+
 	if (arg) {
 		delete AudioEngine::instance()->_main_thread;
 		/* the special thread created/managed by the backend */