diff --git a/libs/ardour/ardour/region.h b/libs/ardour/ardour/region.h
index 29244a6e74..af50f1949b 100644
--- a/libs/ardour/ardour/region.h
+++ b/libs/ardour/ardour/region.h
@@ -123,7 +123,7 @@ public:
 	timepos_t start ()     const { return _start.val(); }
 	timecnt_t length ()    const { return _length.val(); }
 	timepos_t end()        const;
-	timepos_t nt_last()    const { return end().decrement_by_domain(); }
+	timepos_t nt_last()    const { return end().decrement(); }
 
 	timepos_t source_position () const;
 	timepos_t source_relative_position (Temporal::timepos_t const &) const;
diff --git a/libs/ardour/audioregion.cc b/libs/ardour/audioregion.cc
index 556ef89135..961bf03f5c 100644
--- a/libs/ardour/audioregion.cc
+++ b/libs/ardour/audioregion.cc
@@ -1969,7 +1969,7 @@ AudioRegion::find_silence (Sample threshold, samplecnt_t min_length, samplecnt_t
 Temporal::Range
 AudioRegion::body_range () const
 {
-	return Temporal::Range ((position() + _fade_in->back()->when).increment_by_domain(), end().earlier (_fade_out->back()->when));
+	return Temporal::Range ((position() + _fade_in->back()->when).increment(), end().earlier (_fade_out->back()->when));
 }
 
 boost::shared_ptr<Region>
diff --git a/libs/ardour/playlist.cc b/libs/ardour/playlist.cc
index 60d0cd459e..71f5cdd498 100644
--- a/libs/ardour/playlist.cc
+++ b/libs/ardour/playlist.cc
@@ -692,7 +692,7 @@ Playlist::add_region (boost::shared_ptr<Region> region, timepos_t const & positi
 	timepos_t pos = position;
 
 	if (times == 1 && auto_partition) {
-		partition_internal (pos.decrement_by_domain(), (pos + region->length ()), true, rlock.thawlist);
+		partition_internal (pos.decrement(), (pos + region->length ()), true, rlock.thawlist);
 		for (auto const & r : rlock.thawlist) {
 			_session.add_command (new StatefulDiffCommand (r));
 		}
@@ -1051,7 +1051,7 @@ Playlist::partition_internal (timepos_t const & start, timepos_t const & end, bo
 				current->clear_changes ();
 				thawlist.add (current);
 
-				current->modify_end_unchecked (pos2.decrement_by_domain(), true);
+				current->modify_end_unchecked (pos2.decrement(), true);
 
 			} else if (overlap == Temporal::OverlapEnd) {
 
@@ -1089,7 +1089,7 @@ Playlist::partition_internal (timepos_t const & start, timepos_t const & end, bo
 				current->clear_changes ();
 				thawlist.add (current);
 
-				current->modify_end_unchecked (pos2.decrement_by_domain(), true);
+				current->modify_end_unchecked (pos2.decrement(), true);
 
 			} else if (overlap == Temporal::OverlapStart) {
 
@@ -1227,7 +1227,7 @@ Playlist::cut (timepos_t const & start, timecnt_t const & cnt, bool result_is_hi
 
 	{
 		RegionWriteLock rlock (this);
-		partition_internal (start, (start+cnt).decrement_by_domain(), true, rlock.thawlist);
+		partition_internal (start, (start+cnt).decrement(), true, rlock.thawlist);
 	}
 
 	return the_copy;
@@ -1326,7 +1326,7 @@ Playlist::duplicate_until (boost::shared_ptr<Region> region, timepos_t & positio
 {
 	RegionWriteLock rl (this);
 
-	while ((position + region->length()).decrement_by_domain() < end) {
+	while ((position + region->length()).decrement() < end) {
 		boost::shared_ptr<Region> copy = RegionFactory::create (region, true, false, &rl.thawlist);
 		add_region_internal (copy, position, rl.thawlist);
 		set_layer (copy, DBL_MAX);
diff --git a/libs/ardour/region.cc b/libs/ardour/region.cc
index 1776b3b6d3..5956b0a02d 100644
--- a/libs/ardour/region.cc
+++ b/libs/ardour/region.cc
@@ -881,7 +881,7 @@ Region::cut_end (timepos_t const & new_endpoint)
 void
 Region::modify_front_unchecked (timepos_t const & new_position, bool reset_fade)
 {
-	timepos_t last = end().decrement_by_domain();
+	timepos_t last = end().decrement();
 	timepos_t source_zero;
 
 	if (position() > start()) {
diff --git a/libs/evoral/ControlList.cc b/libs/evoral/ControlList.cc
index 5b4dbb0cb3..050e36a34c 100644
--- a/libs/evoral/ControlList.cc
+++ b/libs/evoral/ControlList.cc
@@ -1109,10 +1109,10 @@ ControlList::shift (timepos_t const & time, timecnt_t const & distance)
 			}
 			pos += distance;
 		} else if (distance.is_negative() && pos > 0) {
-			ControlEvent cp (pos.decrement_by_domain(), 0.0);
+			ControlEvent cp (pos.decrement(), 0.0);
 			iterator s = lower_bound (_events.begin(), _events.end(), &cp, time_comparator);
 			if (s != _events.end ()) {
-				_events.insert (s, new ControlEvent (pos.decrement_by_domain(), v0));
+				_events.insert (s, new ControlEvent (pos.decrement(), v0));
 			}
 		}
 		if (!dst_guard_exists) {
diff --git a/libs/temporal/temporal/timeline.h b/libs/temporal/temporal/timeline.h
index beb08a45ff..66b94b9554 100644
--- a/libs/temporal/temporal/timeline.h
+++ b/libs/temporal/temporal/timeline.h
@@ -181,8 +181,7 @@ class LIBTEMPORAL_API timepos_t : public int62_t  {
 	 * timepos_t that is the previous (earlier) possible position given
 	 * this one
 	 */
-	timepos_t decrement () const { return timepos_t (flagged(), val() > 0 ? val() - 1 : 0); /* cannot go negative */ }
-	timepos_t decrement_by_domain () const { return timepos_t (flagged(),
+	timepos_t decrement () const { return timepos_t (flagged(),
 	                                                           is_beats() ?
 	                                                           (val() > 0 ? val() - 1 : 0) :  /* reduce by 1 tick */
 	                                                           (val() > samples_to_superclock (1, TEMPORAL_SAMPLE_RATE) ? val() - samples_to_superclock (1, TEMPORAL_SAMPLE_RATE) : 0)); }
@@ -190,8 +189,7 @@ class LIBTEMPORAL_API timepos_t : public int62_t  {
 	/* purely for reasons of symmetry with ::decrement(), return a
 	 * timepos_t that is the next (later) possible position given this one
 	 */
-	timepos_t increment () const { return timepos_t (flagged(), val() + 1); }
-	timepos_t increment_by_domain () const { return timepos_t (flagged(), (is_beats() ? (val() + 1) : (val() + samples_to_superclock (1, TEMPORAL_SAMPLE_RATE)))); }
+	timepos_t increment () const { return timepos_t (flagged(), (is_beats() ? (val() + 1) : (val() + samples_to_superclock (1, TEMPORAL_SAMPLE_RATE)))); }
 
 
 	timepos_t & operator+=(timecnt_t const & d);
@@ -393,10 +391,8 @@ class LIBTEMPORAL_API timecnt_t {
 	 * samples_to_superclock(1)
 	 */
 
-	timecnt_t decrement () const { return timecnt_t (_distance - 1, _position); }
-	timecnt_t decrement_by_domain () const { return timecnt_t (_distance.flagged() ? _distance - 1 : _distance - samples_to_superclock (1, TEMPORAL_SAMPLE_RATE),  _position); }
-	timecnt_t increment () const { return timecnt_t (_distance + 1, _position); }
-	timecnt_t increment_by_domain () const { return timecnt_t (_distance.flagged() ? _distance + 1 : _distance + samples_to_superclock (1, TEMPORAL_SAMPLE_RATE),  _position); }
+	timecnt_t decrement () const { return timecnt_t (_distance.flagged() ? _distance - 1 : _distance - samples_to_superclock (1, TEMPORAL_SAMPLE_RATE),  _position); }
+	timecnt_t increment () const { return timecnt_t (_distance.flagged() ? _distance + 1 : _distance + samples_to_superclock (1, TEMPORAL_SAMPLE_RATE),  _position); }
 
 	//timecnt_t operator- (timepos_t const & t) const;
 	//timecnt_t operator+ (timepos_t const & t) const;