Enbridge Inc. says it has restarted a pipeline that spilled oil in the Chicago area last week.

The U.S. affiliate of the Calgary-based pipeline giant said Friday the pipeline is now back in service.

A leak was discovered last Thursday on the line that carries crude from Wisconsin to Indiana. It is part of the same network as another Enbridge pipeline in Michigan that ruptured in July.

The two pipeline closures have made it difficult for Canadian oil-sands producers to get their product to their biggest market, the United States.