The Super Eagles were held 1-1 in an international friendly played at the Austrian city of St.Veit an der Glan yesterday.
With the result, the Super Eagles drew one and lost one of their two friendlies in Austria, after the 1-0 loss to Algeria in Klagenfurt on Friday.
Striker Iheanacho received the ball inside the box with his back to goal in the 21st minute, but the Leicester City man turned, despite close attention from the Tunisian defence, to fire into the top right corner, for the opening goal of the game.
The Super Eagles should have gone ahead 2-0 in the 28th minute after captain Ahmed Musa was brought down inside the box by Tunisia goalkeeper Ben Mustapha.
However the shotstopper redeemed himself, saving the resultant penalty kick from Iheanacho.
It was an improved performance from the Eagles, following the lethargic display against Algeria with regulars Iheanacho, Musa, Simon and Kenneth Omeruo returning to the starting line up.