diff --git a/libs/ardour/async_midi_port.cc b/libs/ardour/async_midi_port.cc
index f282d238cc..bd583328c3 100644
--- a/libs/ardour/async_midi_port.cc
+++ b/libs/ardour/async_midi_port.cc
@@ -52,7 +52,9 @@ AsyncMIDIPort::AsyncMIDIPort (string const & name, PortFlags flags)
 	, _last_write_timestamp (0)
 	, output_fifo (512)
 	, input_fifo (1024)
+#ifndef PLATFORM_WINDOWS
 	, xthread (true)
+#endif
 {
 }
 
@@ -116,12 +118,13 @@ AsyncMIDIPort::cycle_start (MIDI::pframes_t nframes)
 		for (MidiBuffer::iterator b = mb.begin(); b != mb.end(); ++b) {
 			input_fifo.write (when, (Evoral::EventType) 0, (*b).size(), (*b).buffer());
 		}
-		
+
+#ifndef PLATFORM_WINDOWS
 		if (!mb.empty()) {
 			xthread.wakeup ();
 		}
+#endif
 	}
-
 }
 
 void
diff --git a/libs/ardour/globals.cc b/libs/ardour/globals.cc
index 8646b819f3..0cda9ebdf4 100644
--- a/libs/ardour/globals.cc
+++ b/libs/ardour/globals.cc
@@ -584,10 +584,21 @@ clock_gettime (int /*clk_id*/, struct timespec *t)
 microseconds_t
 ARDOUR::get_microseconds ()
 {
+#ifdef PLATFORM_WINDOWS
+	microseconds_t ret = 0;
+	LARGE_INTEGER freq, time;
+
+	if (QueryPerformanceFrequency(&freq))
+		if (QueryPerformanceCounter(&time))
+			ret = (microseconds_t)((time.QuadPart * 1000000) / freq.QuadPart);
+
+	return ret;
+#else
 	struct timespec ts;
 	if (clock_gettime (CLOCK_MONOTONIC, &ts) != 0) {
 		/* EEEK! */
 		return 0;
 	}
 	return (microseconds_t) ts.tv_sec * 1000000 + (ts.tv_nsec/1000);
+#endif
 }