A convicted murder set off a prison sprinkler system before complaining officers failed to save his book collection, a court heard.
Steven Brady caused hundreds of pounds of damage to the cell by using a lighter to set off the fire alarm.
The 28-year-old from Aberdeen was jailed for life in 2009 for the murder of Raymond Brennan, 47.
Brady admitted damaging furniture and fittings at Perth Prison by activating the sprinkler system on 19 January.
He was given a two month sentence to run alongside his current jail term for the new offence.
Depute fiscal Carol Whyte told Perth Sheriff Court: "The fire alarm panel activated and officers went into the cell and saw that the sprinkler system had been activated and the cell was flooded.
"The accused was moved to another area and he admitted to staff he had used his lighter under the detector to activate the sprinkler system.
"The total damage to the cell was £436, including parts and labour."
In a letter pleading guilty, Brady said he set off the alarm because he feared for his life.
He said: "Mostly all of my personal property went missing after this event, with no explanation from staff.
"There was one PlayStation, ten games and 76 books costing an average of £6.99 each."