diff --git a/libs/ardour/test/testrunner.cc b/libs/ardour/test/testrunner.cc
index bff2268d50..41bc52393c 100644
--- a/libs/ardour/test/testrunner.cc
+++ b/libs/ardour/test/testrunner.cc
@@ -11,6 +11,7 @@
 
 #include "pbd/debug.h"
 #include "ardour/ardour.h"
+#include "temporal/types.h"
 #include "test_ui.h"
 
 static const char* localedir = LOCALEDIR;
@@ -51,6 +52,8 @@ main(int argc, char* argv[])
 
 	CPPUNIT_ASSERT (ARDOUR::init (true, localedir));
 
+	Temporal::reset();
+
 	TestUI* test_ui = new TestUI();
 
 	CppUnit::TestResult testresult;
diff --git a/libs/temporal/superclock.cc b/libs/temporal/superclock.cc
index c90df0a6bd..54b1a38b13 100644
--- a/libs/temporal/superclock.cc
+++ b/libs/temporal/superclock.cc
@@ -19,7 +19,7 @@
 #include "temporal/superclock.h"
 
 #ifndef COMPILER_MSVC
-Temporal::superclock_t Temporal::_superclock_ticks_per_second = 282240000 ; /* 2^10 * 3^2 * 5^4 * 7^2 */
+Temporal::superclock_t Temporal::_superclock_ticks_per_second = 0;
 #endif
 
 int Temporal::most_recent_engine_sample_rate = 48000; /* have to pick something as a default */
diff --git a/libs/temporal/tempo.cc b/libs/temporal/tempo.cc
index 5a676e24dc..9ef3a4e662 100644
--- a/libs/temporal/tempo.cc
+++ b/libs/temporal/tempo.cc
@@ -4373,7 +4373,7 @@ TempoMap::ramped_twist_tempi (TempoPoint& unused, TempoPoint& focus, TempoPoint&
 void
 TempoMap::init ()
 {
-	WritableSharedPtr new_map (new TempoMap (Tempo (120, 4), Meter (4, 4)));
+	WritableSharedPtr new_map (new TempoMap ());
 	_map_mgr.init (new_map);
 	fetch ();
 }
diff --git a/libs/temporal/temporal/superclock.h b/libs/temporal/temporal/superclock.h
index e3394c915d..bbf7bc6f71 100644
--- a/libs/temporal/temporal/superclock.h
+++ b/libs/temporal/temporal/superclock.h
@@ -32,7 +32,7 @@ typedef int64_t superclock_t;
 #ifndef COMPILER_MSVC
 	extern superclock_t _superclock_ticks_per_second;
 #else
-	static superclock_t _superclock_ticks_per_second = 282240000; /* 2^10 * 3^2 * 5^4 * 7^2 */
+	static superclock_t _superclock_ticks_per_second = 0;
 #endif
 
 extern bool scts_set;
diff --git a/libs/temporal/temporal/tempo.h b/libs/temporal/temporal/tempo.h
index df877e70dc..1cc8c6c3ef 100644
--- a/libs/temporal/temporal/tempo.h
+++ b/libs/temporal/temporal/tempo.h
@@ -792,6 +792,7 @@ class /*LIBTEMPORAL_API*/ TempoMap : public PBD::StatefulDestructible
 	/* and now on with the rest of the show ... */
 
   public:
+	LIBTEMPORAL_API TempoMap () {}
 	LIBTEMPORAL_API TempoMap (Tempo const& initial_tempo, Meter const& initial_meter);
 	LIBTEMPORAL_API TempoMap (TempoMap const&);
 	LIBTEMPORAL_API TempoMap (XMLNode const&, int version);
diff --git a/libs/temporal/test/testrunner.cc b/libs/temporal/test/testrunner.cc
index d1802576a0..9222e3caf0 100644
--- a/libs/temporal/test/testrunner.cc
+++ b/libs/temporal/test/testrunner.cc
@@ -51,9 +51,7 @@ main(int argc, char* argv[])
 	if (!PBD::init ()) return 1;
 	Temporal::init ();
 
-	// TempoMap::SharedPtr tmap = TempoMap::write_copy (); /* get writable copy of current tempo map */
-	// change it
-	// TempoMap::update (tmap); /* update the global tempo map manager */
+	Temporal::reset();
 
 	CppUnit::TestResult testresult;