Kris Doolan came off the bench to score a stoppage-time equaliser for Partick in their 1-1 draw at Raith.
Jackie McNamara's side came into the game with a 100 per cent record from their opening six league games, but failed to make the most of their early pressure, Paul Paton going closest with a six-yard header.
Stuart Bannigan almost made the breakthrough moments before half-time, but Rovers goalkeeper David McGurn made a great save to deny the teenage midfielder.
Grant Murray's men improved after the break and only Aaron Muirhead's last-ditch tackle prevented Greig Spence from opening the scoring.
The hosts went ahead 11 minutes later when Spence emphatically fired home after a defensive error.
Visiting goalkeeper Scott Fox then made two fine saves to keep his side in the game before Doolan headed home Muirhead's cross to level at the death.