The Hainaut team also had a great chance before the break, but Teddy Chevalier failed face to face with KVO goalkeeper Liam Bossin.
After the break, the 27-year-old Irish Belgian distinguished himself once again on attempts by Corenthyn Lavie and one by Fode Guirassy. That paid off in spades when Ewan Henderson gave the Coastal Boys a flattering victory.
In the standings, Deinze, together with Zulte Waregem, Lommel and Dender, ends up in a provisional second place, three points behind leader Beerschot, which won at Seraing earlier on Saturday. RSCA Futures, Francs Borains and Ostend form the bottom of the rankings in the second highest class.