The original deadline was due to expire on November 30.
As a result of this change, all other deadlines indicated in the envisaged timetable in the tender's pre-qualification document will be amended accordingly, the state-owned JP Autoputevi RS said on its website on Friday.
The PPP tender for the 46.6 kilometre Doboj–Vukosavlje road section, which will be part of international transport Corridor Vc, was launched in August.
The Serb Republic is one of the two autonomous entities that make up Bosnia and Herzegovina. The other one is the Muslim-Croat Federation.