Tavistock Minor Injuries Unit will stay closed until early next year, health bosses have announced.
The centre closed its doors back in August because of staffing shortages.
It had been due to re-open on November 5th, but will now stay shut until 2020.
University Hospitals Plymouth NHS Trust says more staff will be recruited and trained.
Patients who would normally use Tavistock Minor Injuries Unit can use the Cumberland Centre in Plymouth or visit centres in Liskeard, Launceston or Okehampton. Details for these units can be found here.
GP surgeries at Abbey, Tavyside, Yelverton and Okehampton can also offer a minor injury service.