Iain Chisholm's goal was enough to give Dumbarton victory and deny Highland League outfit Fraserburgh the chance of a Scottish Cup shock.
Graham Johnston and Neil Main sent efforts inches off target as the home side failed to capitalise on having the majority of the first half.
Andrew Geggan struck the post as the Third Division visitors took control.
And Chisholm rose above goalkeeper William West to nod home the winner despite home claims for offside.
Fraserburgh: William West, Milne (Beajrie 37), McBride, Dickson, Ralph, Hay, Neil Main, Robert West, Johnstone, Stephen Main (Micheal Stephen 71), Morrice (Wemyss 82). Subs Not Used: Hale, Gordon.
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