Matty Godden’s 18th goal of the season helped Charlton secure their place in the League One play-offs with a 2-1 win over Northampton.

Luke Berry put the Addicks ahead in the ninth minute. The attacking midfielder struck a right-footed volley home after Northampton defender TJ Eyoma could only partially cut out Godden’s cross.

Dara Costelloe equalised for the visitors soon after. The striker sent goalkeeper Will Mannion the wrong way from the penalty spot after referee Ollie Yates penalised Tom McIntyre for handling Tariqe Fosu’s teasing delivery.

Former Charlton winger Fosu produced a terrible miss in the 53rd minute from close range after being picked out by Tyler Roberts – his attempt harmlessly drifting out towards the left touchline.

Godden rattled the crossbar in the 67th minute from Thierry Small’s cross but the veteran striker made no mistake four minutes later, sliding his finish underneath Northampton goalkeeper Lee Burge after racing on to Chuks Aneke’s flick-on.

Northampton substitute James Wilson was just unable to reach Costelloe’s pass as Charlton endured a nervy finish but moved up to fourth in the table.