Ospreys passed up a golden opportunity to climb back into the Guinness Pro12 play-off places as a final-minute Jimmy Gopperth penalty sealed a 9-9 draw for Leinster at the Liberty Stadium.
The hosts were 9-6 up going into the final 90 seconds, when replacement Morgan Allen was penalised in his 22 at a ruck. Gopperth stepped up and put the ball through the posts to claim his third penalty and give the visitors a share of the spoils.
The Ospreys' points came by way of two penalties and a drop goal from outside-half Sam Davies, who was forced from the field midway through the second half for a concussion check.
Prop Ryan Bevington was named in the Ospreys team after passing concussion protocols following his blow to the head in the 19-16 defeat to Glasgow.
There were four changes to the team including Scott Otten, Dmitri Arhip and Joe Bearman, who came in for Wales trio Scott Baldwin, Aaron Jarvis and Justin Tipuric.
Leinster coach Matt O'Connor made seven changes from the side which beat Zebre last weekend, including the return of Rhys Ruddock - his first match since December.
In a pretty uninspiring first half, that was dominated by an aerial kicking duel, Leinster led by the interval by 6-3 despite not entering Opsreys' 22 once.
Leinster's dominance came through a strong scrummage, but it was the Ospreys who enjoyed much more territory.
After a series of dull kicking exchanges it was Leinster who took the lead with two Gopperth penalties on 15 and 23 minutes.
Ospreys went through the phases on a couple of occasions as they entered the Leinster 22, but the Irish team's defence held firm.
That was until the end of the first half, when Ospreys broke their duck with a penalty goal for Davies from inside the 22.
Davies was on target again two minutes into the second half with a drop goal from an encouraging Ospreys attack before following that up with a 55th-minute penalty to take the home side into the lead for the first time.
The Ospreys looked like they were heading for a win and fourth place in the table in a game that never really looked like producing a try.
But the ever-reliable boot of Gopperth ensured Leinster returned home with something, leaving the Ospreys fans unhappy with their points return.