Red-faced African Nations Cup organisers were forced to start the second half of the semi-final between Nigeria and Tunisia here on Wednesday by playing the Nigerian national anthem.
At the start of the game, the wrong tune was played for Nigeria but it was still jeered by the Tunisian crowd.
Similar catcalls and whistles greeted the correct anthem when it was finally found and played.
The two teams were level at 0-0 at the interval at Rades Stadium.