Sladjana Lojanovic, 37, a farmer from the town of Sid in the north, said on Saturday she came to support students.
“The institutions have been usurped and… there is a lot of corruption. Elections are the solution, but I don’t think he (Vucic) will want to go peacefully,” she told Reuters.
The president has previously refused snap elections. His Progressive Party-led coalition holds 156 of 250 parliamentary seats.
Mr Vucic’s opponents accuse him and his allies of ties to organised crime, corruption, violence against rivals and curbing media freedoms, which they deny.
He has maintained close ties to Russia, and Serbia – a candidate for EU membership – has not joined the Western sanctions regime imposed on Moscow over its invasion of Ukraine.
