Stranraer moved a huge step towards promotion to the Second Division after taking a two-goal lead from their play-off final against Albion Rovers.
The Blues took the lead six minutes before half-time when Frank McKeown tapped home.
Rovers, who finished ninth in Division Two, rarely threatened but looked like they would return to Coatbridge with only a narrow defeat.
But Michael Moore found the bottom corner in stoppage time.
And defeat leaves Rovers staring relegation in the face unless they can overcome the deficit in Sunday's second leg on their home patch.
Rovers, who recovered from a 1-0 first-leg defeat by Elgin City in their semi-final, fell behind when McKeown finished off Stephen Stirling's cross from six yards.
Martin Grehan came close to doubling Stranraer's lead 10 minutes into the second half, but Rovesr goalkeeper Derek Gaston parried away his 18-yard effort.
Sean Winter missed a decent close-range chance for the hosts, while the visitors' only threat came from Sean Pierce and Ryan McStay, who fired shots off target from range.
Stranraer, who had defeated Queen's Park home and away in their semi, added a crucial second goal in the dying seconds when Moore found the target from 12 yards.
: David Mitchell, Taggart, McKeown, McGregor, Noble, Winter, Christopher Aitken, Stirling, Gallagher, Malcolm, Grehan (Moore 80). Subs Not Used: Marshall, Stuart McColm, Belkouche, Kane.
: Christopher Aitken.
: McKeown 39, Moore 90.
: Gaston, Ciaran Donnelly, Lumsden, O'Byrne, Russell, Stevenson, Canning, McStay, Boyle (Marriott 89), Pierce (Love 46), Gemmell. Subs Not Used: Fahey, Acquah, Chaplain.
: Ciaran Donnelly, Gemmell.
: Stevie O'Reilly