Canada Post is extending its lockout notice to Monday at 12:01 a.m. eastern time.
It says it is willing to submit to binding arbitration in an effort to resolve the ongoing labour dispute.
The extension was announced late Wednesday in a statement. The original deadline was for this Friday.
Canada Post hopes the Canadian Union of Postal Workers will also agree to binding arbitration.
But the two sides are still believed to be very far apart. There are currently no talks planned.
CUP-W is suggesting a one month cooling off period.