Colin Nish struck the winner as Dumbarton beat Alloa 1-0 to book their place in the quarter-finals of the William Hill Scottish Cup.
On the half-hour, Scott Agnew hooked the ball across goal and Nish was there to tap home from close range high into the net.
Dumbarton had the chance to double their lead in the 41st minute when they were awarded a penalty after Christopher Kane drew a foul from Scott Bain in the area.
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However, the goalkeeper, who injured himself and received a yellow card in the process, made amends by smartly saving Kane's spot-kick.
Scott Linton almost doubled Dumbarton's lead in the 69th minute, but his effort hit the crossbar.