LIMA, Peru (CNN) -- In the second major shake-up in Peru's government in two days, President Alberto Fujimori accepted the resignation Friday of his economic minister, Jorge Camet, the longest-serving member of his cabinet.

While there was no official word on his replacement, a source at the national tax agency told Reuters that its head, Jorge Baca, would be named to the post.

On Thursday, Fujimori unexpectedly replaced Prime Minister Alberto Pandolfi, one of his closest allies, with Javier Valle Riestra, 66, who had once been a congressman for a political party that bitterly opposes the president.

Political analysts in Peru said they believed the cabinet reshuffling could be a prelude to an attempt by Fujimori to run for an unprecedented third term in 2000. Presidential sources said more ministerial changes could not be ruled out.

However, in an odd twist, Valle Riestra told reporters that he was opposed to the idea of Fujimori serving another term.

"We must 'de-monarchize' power. This does not mean I am Fujimori's enemy, but that I am the enemy of re-election," he said.

In on a loophole?

Peru's constitution specifically forbids a president serving more than two successive terms. But Fujimori's supporters argue that provision shouldn't stop the president from seeking re-election because it was written into a constitution adopted in 1993, three years after Fujimori's first election.

One of Peru's most fiercely debated political issues is whether Fujimori should be allowed to use that loophole to run again. A pro-democracy group, backed by Peru's opposition, announced last month that it had gathered enough petition signatures to force a referendum on the issue.

Polls show most Peruvians want such a referendum and oppose a third term for Fujimori, whose popularity has slid in recent years.

Fujimori has not said he will seek another term. But many of his allies have said they believe he would like to run again if given the chance.

Some political analysts speculated that Valle Riestra's stance against re-election could be part of a ploy by Fujimori to bolster his democratic credentials.

"It's a very sophisticated way of quashing the criticisms [of a re-election bid]," said political analyst Francisco Sagasti. "This could very well be an elaborate smoke screen."

But Valle Riestra, a constitutional lawyer, said he would act as the government's spokesman for democracy.

"I am going to become part of the cabinet of ministers as a spokesman for the democratic convictions I believe in. As with all regimes, there are autocratic profiles, but this should be modified and softened," he said, an apparent reference to Fujimori's autocratic image among many Peruvians.

Reuters contributed to this report.