The preparations had been thrown into doubt by violence sparked by the fraud conviction of two senior election officials.
The postponement announcement came after a meeting between interim Prime Minister Jean-Marie Dore and the two candidates, Cellou Dalein Diallo and Alpha Conde, the AFP news agency reports.

"We need two weeks to prepare well," said Independent National Electoral Commission (Ceni) spokesman Thierno Ceydou Bayo.

Foumba Kourouma, a member of Ceni, told Reuters the commission would meet candidates on Thursday to set a new date.
The first round of the elections was seen as Guinea's first democratic vote since independence in 1958, raising hopes of an end to military and authoritarian rule in the mineral-rich country.

The BBC reports that it was difficult to see how the elections could be held on Sunday, as a lot of logistical work still had to be done, such as transporting election materials to remote areas.

The head of Ceni, Ben Sekou Sylla - who was one of those sentenced to a year in jail - died on Tuesday after an unspecified long illness.