Leinster withstood a second-half surge from Munster to win 13-6 in an arm-wrestle at Thomond Park and maintain their 100% record in the Pro14.
Leo Cullen's men repeated their St Stephen's Day 2017 victory to inflict Munster's first defeat in 22 games in Limerick.
Leinster had a significant wind advantage in the first half and made good use of it as Ed Byrne went over for a converted try and Ross Byrne added two penalties.
Munster were kicking possession away into the breeze and only managed to get on the board in the closing seconds of the half thanks to JJ Hanrahan's penalty.
The elements were in the hosts' favour after the restart and Hanrahan narrowed the gap to seven after 46 minutes but that was to be the last score of the game.
Munster dominated possession but gave away costly penalties in attack and twice coughed up possession from lineouts, including one on the 5m line in the closing seconds.
The main bright spot for Munster was the return of outhalf Joey Carbery, who came off the bench to make his first appearance since the World Cup.
The losing bonus point means they remain one clear of Edinburgh at the top of Conference B while Leinster are 11 clear of Ulster at the head of Conference A after nine wins in a row.
The IRFU player welfare programme may have removed some stardust from this fixture, but there were still terrific individual performances, with Leinster number eight Caelan Doris in man-of-the-match form and his opposite number Jack O'Donoghue also standing out.
Munster's eagerness for a strong start was punctured by loosehead Byrne's ninth-minute touchdown. James Lowe's incisive run did the initial damage, and after Jimmy O'Brien and Andrew Porter were stopped short, Ed Byrne managed to burrow over.
Ross Byrne converted and then tagged on a 22nd-minute penalty, punishing Chris Cloete's breakdown offence.
Scrum-half Rowan Osborne stood up well to the Thomond Park pressure, the 23-year-old making his first start as a late inclusion to replace the ill Jamison Gibson-Park.
Territory-starved Munster were boosted by O'Donoghue's maul defence and a subsequent scrum penalty.
However, a lineout infringement by the Waterford man allowed Ross Byrne to put 13 points between the sides.
It was back to a 10-point difference after Hanrahan rewarded a late Munster surge, which came from a Nick McCarthy charge-down and another scrum penalty.
The Munster fly-half doubled his contribution after a spritely start to the second half.
While Leinster showed impressive ball retention, Munster were finding joy through the direct route. Rory Scannell's booming touchfinder and the 56th-minute entry of the returning Carbery raised the decibel level significantly.
It was tit-for-tat past the hour mark, Sean Cronin's turnover penalty being followed by an O'Donoghue-led choke tackle on Doris. Munster built momentum through their forward carries, but a promising maul was grounded and Scott Fardy soon swooped in for a turnover penalty.
Having leaked six tries to Ulster last week, the Leinster coaches were visibly pleased to keep Munster try-less.
Their desire to extend their winning streak this season to 13 games was summed up by Will Connors and Cronin's double tackle on Darren O'Shea during Munster's late onslaught.
