The former Bosnian Serb military commander, Ratko Mladic, will not have his trial on genocide, crimes against humanity and war crimes divided into two parts.
The prosecution had requested the first trial to deal with the massacre of up to 8,000 Muslim men and boys at Srebrenica in 1995, and the second trial to tackle the siege of Sarajevo and other matters.
However, in a ruling this evening, the judges at the International Criminal Tribunal for the Former Yugoslavia rejected the request.
Lawyers for Mr Mladic had opposed the proposal.
The Prosecution has the right to appeal the decision. However, it is not clear if this option will be followed-up.