Coventry bounced back from their FA Cup defeat at Colchester to push freefalling Nottingham Forest closer to the Division One trapdoor.
The Sky Blues struck four minutes in at the City Ground, Patrick Suffo firing past a helpless Darren Ward.
Forest had their chances to level, Michael Chopra blasting wide and Marlon King heading past the post.
But Paul Hart's side have not scored in eight league games and are two points adrift of safety.
Coventry went ahead when midfielder Stephen Warnock cut in from the left flank and teed up Suffo, who shimmied past Chris Doig before slotting into the corner.
Forest midfielder Danny Sonner went in search of an equaliser but his aerial effort from a Matthieu Louis-Jean cross was never likely to trouble Scott Shearer in the Coventry goal.
But there was panic in the Sky Blues goalmouth on the 20-minute mark when Shearer needed two bites to claim Andy Reid's right-wing corner.
Chopra, given a debut after having arrived on loan from Newcastle just 48 hours earlier, went close with a fierce shot on the turn but King could only head wide as the interval approached.
Gareth Taylor came on after the break and his shot was stopped by Shearer, before Chopra's half-volley brushed the side-netting.
Taylor went close moment later too as he met Reid's left-wing supply with a flying header directed marginally wide.
But Warnock should have doubled the visitors' advantage instead of blazing over the bar when through on goal in the 90th minute.
Nottm Forest: Ward, Louis-Jean, Walker, Doig, Robertson,
Sonner, Williams, Bopp, Reid, King, Chopra. Subs: Jess, Roche,
Taylor, Gunnarsson, Cash.
Coventry: Shearer, Whing, Davenport, Staunton, Gordon,
Gudjonsson, Deloumeaux, Doyle, Warnock, Suffo, Joachim. Subs:
Ward, Shaw, McSheffrey, Pead, Morrell.
Referee: G Salisbury (Lancashire).