Queen of the South ousted First Division Dumbarton in the first round of the Ramsdens Cup.
The Division Two visitors threatened when Kevin Smith fired in a shot from close range that forced Stephen Grindlay into making a reaction save.
Grindlay also denied Nicky Clark before the Sons' James Creaney had an effort parried by Queens keeper Lee Robinson.
The breakthrough came 21 minutes from the end when Clark headed Daniel Carmichael's cross into the net.
Dumbarton: Grindlay, Marr, Lithgow, Andy Graham, Creaney, Gilhaney (Johnston 73), Flening, Agnew, McDougall, Lister, Prunty (Lamont 73). Subs Not Used: Ewings, McNiff, Lyden.
Queen of South: Robinson, McGuffie, Durnan, Higgins, Holt, Carmichael, McKenna, Derek Young, Gibson (Lyle 79), Smith (Reilly 63), Clark. Subs Not Used: Atkinson, Mitchell, Johnston.
Booked: Higgins, McKenna.
Goals: Clark 69.
Ref: Gary Hilland