diff --git a/gtk2_ardour/dsp_stats_ui.cc b/gtk2_ardour/dsp_stats_ui.cc
index 44a6eaae6e..5dd21b7829 100644
--- a/gtk2_ardour/dsp_stats_ui.cc
+++ b/gtk2_ardour/dsp_stats_ui.cc
@@ -125,8 +125,8 @@ DspStatisticsGUI::stop_updating ()
 void
 DspStatisticsGUI::update ()
 {
-	uint64_t min = 0;
-	uint64_t max = 0;
+	PBD::microseconds_t min = 0;
+	PBD::microseconds_t max = 0;
 	double   avg = 0.;
 	double   dev = 0.;
 	char buf[64];
@@ -205,8 +205,8 @@ DspStatisticsGUI::update ()
 
 	if (_session) {
 
-		uint64_t smin = 0;
-		uint64_t smax = 0;
+		PBD::microseconds_t smin = 0;
+		PBD::microseconds_t smax = 0;
 		double   savg = 0.;
 		double   sdev = 0.;
 
diff --git a/gtk2_ardour/plugin_dspload_ui.h b/gtk2_ardour/plugin_dspload_ui.h
index a89c8676b1..59aa3f6cd5 100644
--- a/gtk2_ardour/plugin_dspload_ui.h
+++ b/gtk2_ardour/plugin_dspload_ui.h
@@ -58,7 +58,7 @@ private:
 	ArdourWidgets::ArdourButton _reset_button;
 	Gtk::DrawingArea _darea;
 
-	uint64_t _min, _max;
+	PBD::microseconds_t _min, _max;
 	double   _avg, _dev;
 	bool     _valid;
 };
diff --git a/gtk2_ardour/timers.cc b/gtk2_ardour/timers.cc
index d52643904d..e9218542a1 100644
--- a/gtk2_ardour/timers.cc
+++ b/gtk2_ardour/timers.cc
@@ -104,9 +104,9 @@ public:
 	GATOMIC_QUAL gint _suspend_counter;
 
 #ifndef NDEBUG
-	std::vector<uint64_t> rapid_eps_count;
-	std::vector<uint64_t> super_rapid_eps_count;
-	std::vector<uint64_t> fps_eps_count;
+	std::vector<int64_t> rapid_eps_count;
+	std::vector<int64_t> super_rapid_eps_count;
+	std::vector<int64_t> fps_eps_count;
 
 private: