North Atlantic Drilling has amended the revolving credit facility provided by its majority shareholder Seadrill Limited.
The changes mean that the facility will now mature on 31 July and has increased to $150 million.
In a statement, the company said that the funding arrangement had been put in place while broader restructuring negotiations continue at both companies.
The facility was originally entered into on 31 January 2017, with a total value of $25 million maturing on 31 March this year.
In April the facility was amended to mature on 30 June this year, and increased to $50 million.