Mozambique's President Armando Guebuza was on Wednesday re-elected unopposed as leader of the ruling Frelimo party, shaking up the political establishment ahead of a 2014 presidential vote.

Traditionally Frelimo's leader becomes its automatic presidential candidate, but Guebuza is already serving his second five-year term as the country's president, the limit set by the constitution.

Frelimo, in power since independence from Portugal in 1975, has recently been riven by divisions, making it unclear whom the party might choose as its presidential candidate.

Guebuza, 69, has already said he will step down at the end of his term, in line with the constitution.

In his acceptance speech broadcast live on national radio Wednesday, Guebuza committed himself to working for the "dream of all Mozambicans... the dream of well-being and happiness".

Mozambique was hit by riots in 2010 over high food prices that left 14 people dead, a year after Guebuza swept to a second term in a landslide victory.

Next month the country, which is among the poorest in Africa, will mark 20 years since the end of a devastating 16-year civil war which forced millions of people from their homes.