Scott Agnew's second-half penalty was the difference between the sides as Dumbarton beat Alloa.
The visitors started brightly but had to wait until the second minute of first-half stoppage time to get on the scoresheet.
Sons defender Andrew Graham poked the ball past Alloa goalkeeper Scott Bain from the middle of the box.
Alloa piled on the pressure in the early stages on the second half and it was not long before they were back on level terms.
Ryan McCord's corner found Stephen Simmons, who lashed the ball past Jamie Ewings from six yards out to level the scores in the 54th minute.
Dumbarton sealed all three points in the 71st minute when Agnew netted from the spot after Graeme Holmes had fouled Graham.
Alloa: Bain, Michael Doyle, Gordon, Meggatt, Creaney (Marr 39), Cawley, Simmons, McCord, Salmon (McManus 52), Holmes,Kirk.
Subs Not Used: Robertson, Young, Tiffoney, McDowall.
Booked: McCord, Salmon, Michael Doyle, Holmes.
Goals: Simmons 54.
Dumbarton: Ewings, McGinn, Graham, Barry, Linton, Gilhaney, Turner (Fleming 64), Hugh Murray, Agnew,Prunty (Nish 59), Megginson (Kirkpatrick 81).
Subs Not Used: Grindlay, Scott Smith, Kevin Smith, McKerracher.
Goals: Graham 45, Agnew 71 pen.
Ref: Craig Charleston