Minutes before the Dublin singer was due to perform in the Belfast venue, fans were evacuated.
An 'automatic fire alarm' went off around 9pm at Ulster Hall causing eager concert-goers to make their way out onto the street and wait around before it was confirmed as a false alarm.
In true Irish fashion, the revellers weren't going to let an auld wait in the cold dampen their spirits, oh no. What did they do? Break out into a rendition of Queen's 'Bohemian Rhapsody' - AMAZING!
— Siobhan McNamara (@SiobhanNews) December 19, 2018
Once the fire service gave the all clear, the fans made their way back in and soon after, Hozier took to the stage.
Alliance Councillor Sian O'Neill who was at the gig said "the alarms went off and staff acted to get everyone out really quickly."
"The fire brigade were on scene within one minute. It was really impressive given it was sold out and the main act was due on."
The Wicklow native is smack bang in the middle of an epic five-date Irish tour having kicked it off with three nights in the Olympia. His tour comes after his new EP, Nina Cried Power - his first record since his breakthrough album in 2014.
— Niall (@WeeNiallMcG) December 19, 2018
— Caoimhe Ní Chathail (@CaoimheChats) December 19, 2018