Firefighters were called out to HMP La Moye on Saturday night to tackle a blaze in the prison kitchen.
Prison staff called 999 shortly after 8pm, and all the emergency services were dispatched as a precaution.
The fire was put out a short time later.
No one was injured during the incident, and the Prison Service says there is 'no suggestion' of any suspicious activity or the fire being started deliberately.
Contingency plans have been brought in to make sure prisoners are being fed as normal.
Red Arrows still expected for Jersey Air Show
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26 Victoria Village homes get planning permission
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Jersey flights impacted by UK air traffic control issue
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Engine fault sees private jet diverted to Guernsey Airport
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Travel issues ahead of Channel Islands Pride
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St Helier RNLI to make 'Savings Lives At Sea' TV debut
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