diff --git a/libs/ardour/test/automation_list_property_test.cc b/libs/ardour/test/automation_list_property_test.cc
index 9813ee6648..35843dafbc 100644
--- a/libs/ardour/test/automation_list_property_test.cc
+++ b/libs/ardour/test/automation_list_property_test.cc
@@ -46,11 +46,17 @@ write_automation_list_xml (XMLNode* node, std::string filename)
 void
 AutomationListPropertyTest::setUp ()
 {
+	// The reference files were created with this superclock ticks per second
+	// value. Setting this here makes sure we don't need to update all the
+	// reference files whenever the default value changes.
+	_saved_superclock_ticks_per_second = Temporal::superclock_ticks_per_second();
+	Temporal::set_superclock_ticks_per_second(56448000);
 }
 
 void
 AutomationListPropertyTest::tearDown ()
 {
+	Temporal::set_superclock_ticks_per_second(_saved_superclock_ticks_per_second);
 }
 
 void
diff --git a/libs/ardour/test/automation_list_property_test.h b/libs/ardour/test/automation_list_property_test.h
index 39a8466e57..172475b89a 100644
--- a/libs/ardour/test/automation_list_property_test.h
+++ b/libs/ardour/test/automation_list_property_test.h
@@ -19,6 +19,8 @@
 #include <cppunit/TestFixture.h>
 #include <cppunit/extensions/HelperMacros.h>
 
+#include "temporal/superclock.h"
+
 class AutomationListPropertyTest : public CppUnit::TestFixture
 {
 	CPPUNIT_TEST_SUITE (AutomationListPropertyTest);
@@ -31,4 +33,7 @@ public:
 	void tearDown ();
 	void basicTest ();
 	void undoTest ();
+
+private:
+	Temporal::superclock_t _saved_superclock_ticks_per_second;
 };