Night shifts at Nissan's Sunderland plant in north east England are to end, according to the local union.
But Unite told the BBC it believed no jobs would be lost as people would move onto day shifts, although workers would lose a shift allowance.
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The current rate of output – about 440,000 cars a year – would be maintained by the two daytime shifts.
About 3,000 of the plant's 7,000 workers are employed on the night shift at the plant, which makes the Qashqai, Juke and Leaf.
Unite assistant general secretary Steve Turner said in a statement: "Unite has been aware of this announcement for some time and our officers and reps at the plant have been working hard to ensure that the full workforce is protected.
"As a result, no jobs will be lost with current demand being consolidated into the remaining day shifts."
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By GlobalDataThe BBC noted reports last week claiming Nissan was considering taking Qashqai production away from Sunderland in the event of a no-deal Brexit were denied by the company which said it had no plans to move it.
A Nissan statement said: "To support the production of new Juke, extra manufacturing staff will be needed on the plant's production Line Two.
"In a restructuring of the production schedule, these staff will transfer from production Line One, with both lines operating on a two shift pattern. Overall headcount at the plant will remain the same."
