Supporters of the two candidates have clashed in the capital, Conakry Guinea has scheduled its long-delayed presidential run-off vote for 7 November, according to a presidential decree read out on state TV.
The vote was initially due to be held in July, but street violence and political infighting have forced it to be postponed three times.
An inconclusive result in June elections forced the run-off.
Guineans has been subjected to 52 years of authoritarian rule since it gained independence from France.
Last weekend, the two rival presidential candidates – Alpha Conde and Cellou Dalein Diallo – appealed for calm following two days of violence in the capital, Conakry.
The pair had earlier accused each other’s supporters of inciting violence.
The military seized power in 2008 after the death of long-time strongman leader Lansana Conte; but army rule led to more political upheaval and the soldiers eventually agreed to transfer power back to civilians.
The run-off was scheduled for this weekend, but election chief Gen Toumany Sangare said it had been cancelled due to logistical problems.
The UN and US had both urged Guinea to set a new date as soon as possible to avoid instability.
Mr Diallo is seen as the favourite to win the run-off. He took 44% of the votes in the first round – and claims he was denied overall victory by fraud.
Guinea is the world’s largest exporter of the aluminium ore bauxite. It also has important deposits of iron ore, but it remains one of the poorest countries in West Africa.
This article is from the BBC News website. © British Broadcasting Corporation, The BBC is not responsible for the content of external internet sites.