Dumbarton boosted their survival bid after they thrashed already-relegated Airdrie 4-1.
Ian Murray's side took just five minutes to go ahead as Scott Agnew's free-kick found Andrew Graham in the area and the defender headed in his second goal for the club.
Two minutes before the break the lead was doubled as Mark Gilhaney set up the overlapping Paul McGinn to slot into the bottom corner.
James Lister almost added a third in stoppage time but his shot came crashing back off the crossbar after Agnew had been denied by Robbie Thomson.
Three minutes into the second period Steven McDougall's low shot found the bottom corner to make ir 3-0.
Gregor Buchanan pulled one back with a header from William McLaren's corner but Agnew steered in a fourth from close range with 16 minutes left.