The first person jailed in Nova Scotia for failing to keep workers safe while working at heights has pleaded guilty to the same charge, just months after being sentenced on the original offence.

Joseph Isnor entered his plea Wednesday in Halifax provincial court on a charge under the province's Occupational Health and Safety Act following allegations at a worksite in Herring Cove in August.

Sentencing has been set for Feb. 13.

It's not the first time Isnor has been accused of not keeping staff safe on the job. 

He was sentenced in May to 15 days in jail for repeatedly failing to ensure his employees were safe at heights while working for his company, United Roofing Inc. 

Alex Keaveny, the province's special prosecutor for workplace accidents, said the Crown had no advanced warning Isnor would plead guilty on Wednesday.

Keaveny said he anticipates his office will seek more jail time for Isnor during sentencing.

Keaveny told CBC earlier this month the contractor was undeterred by lesser punishments he received for repeated safety violations prior to his first sentence. Fines were not paid on time and safety presentations Isnor was ordered to complete were left undone.