Paul Keegan scored the last-minute goal for Partick Thistle which relegates Stirling Albion from Division One.
Jags manager Ian McCall rested several players ahead of Sunday's Scottish Cup quarter-final replay with Rangers.
However, the home team dominated and on-loan striker Damon Gray squandered three excellent scoring chances.
With time running out, Graeme Eaglesham showed great composure to square for fellow substitute Keegan to fire in the only goal of the game.
Partick Thistle: Tuffey, Storey, Little, John Robertson, McKinlay, McKeown, Mooc (Keegan 68), McStay, Murray (Ardalany 84), Donnelly, Gray (Eaglesham 80). Subs Not Used: Michael Robertson, Hinchcliffe.
Goal: Keegan 90.
Stirling Albion: Christie, Nugent, Graham (Lithgow 84), Ellis, Devine, Steven Bell, Steven Bell, Murphy, Aitken, Taggart (Muir 68), Rodriguez, Cramb (McKenna 68). Subs Not Used: Hay, Hogarth.
Ref: J Underhill