diff --git a/libs/surfaces/osc/osc.cc b/libs/surfaces/osc/osc.cc
index 20d89edfe2..c2956fa551 100644
--- a/libs/surfaces/osc/osc.cc
+++ b/libs/surfaces/osc/osc.cc
@@ -1760,12 +1760,12 @@ OSC::scrub (float delta, lo_message msg)
 
 	float speed;
 
-	boost::posix_time::ptime now = boost::posix_time::microsec_clock::local_time();
-	boost::posix_time::time_duration diff = now - scrub_time;
-	if (diff.total_milliseconds() > 35) {
+	int64_t now = ARDOUR::get_microseconds ();
+	int64_t diff = now - scrub_time;
+	if (diff > 35) {
 		// speed 1 (or 0 if jog wheel supports touch)
 		speed = delta;
-	} else if ((diff.total_milliseconds() > 20) && (fabs(scrub_speed) == 1)) {
+	} else if ((diff > 20) && (fabs(scrub_speed) == 1)) {
 		// add some hysteresis to stop excess speed jumps
 		speed = delta;
 	} else {
@@ -3614,9 +3614,9 @@ OSC::periodic (void)
 
 	if (scrub_speed != 0) {
 		// for those jog wheels that don't have 0 on release (touch), time out.
-		boost::posix_time::ptime now = boost::posix_time::microsec_clock::local_time();
-		boost::posix_time::time_duration diff = now - scrub_time;
-		if (diff.total_milliseconds() > 100) {
+		int64_t now = ARDOUR::get_microseconds ();
+		int64_t diff = now - scrub_time;
+		if (diff > 100) {
 			scrub_speed = 0;
 			session->request_transport_speed (0);
 			// locate to the place PH was at last tick
diff --git a/libs/surfaces/osc/osc.h b/libs/surfaces/osc/osc.h
index 2157b0e278..97f2c4e5eb 100644
--- a/libs/surfaces/osc/osc.h
+++ b/libs/surfaces/osc/osc.h
@@ -186,7 +186,7 @@ class OSC : public ARDOUR::ControlProtocol, public AbstractUI<OSCUIRequest>
 	bool bank_dirty;
 	float scrub_speed;			// Current scrub speed
 	double scrub_place;			// place of play head at latest jog/scrub wheel tick
-	boost::posix_time::ptime scrub_time;	// when did the wheel move last?
+	int64_t scrub_time;	// when did the wheel move last?
 	bool global_init;
 	boost::shared_ptr<ARDOUR::Stripable> _select;	// which stripable out of /surface/stripables is gui selected