The deal is worth $600,000 at the NHL level.
Warsofsky played six games for the Bruins last season and registered his first NHL goal against the Ottawa Senators on Dec. 28. He played in 56 regular-season games for the Providence Bruins of the AHL and posted six goals and 26 assists.
The Bruins acquired the Marshfield, Mass., native and Boston University product via trade with the St. Louis Blues in exchange for forward Vladimir Sobotka on June 26, 2010. He has played 190 games for the P-Bruins.
Bruins general manager Peter Chiarelli recently said Warsofsky is ready for the NHL and will compete for a job during training camp.
Warsofsky is eager to prove that he belongs.
"It definitely gives me a little bit of confidence," he said of Chiarelli's comments. "I think when the management and the coaches say that about you, it pushes you even more. You know that they think you’re capable, and I think I am capable of it also, so I kind of want to go out there and prove them right. And every kid’s dream is to move up from the AHL to the NHL on a regular basis, so that’s what I’m shooting for this year.”