CHICAGO — Jason Heyward gave the Cubs’ run-thirsty lineup a jolt Wednesday night just before they clinched a National League playoff berth.

But even Heyward’s heroics weren’t enough as the Cubs’ bullpen allowed four runs in the eighth and ninth innings that allowed the Pirates to forge a 6-6 tie.

The Cubs prevailed with a 7-6 win in 10 innings when Albert Almora Jr. hit a single with two out to score Terrance Gore.

The Pirates tied the game in the top of the ninth when Starling Marte hit a two-run double off left-hander Justin Wilson that grazed the glove of first baseman Anthony Rizzo.

Heyward hit a two-run home run off Ivan Nova with two out in the first.