A masked man wielding a machete robbed the Domino's Pizza in Florey on Sunday night.
Police said the man entered the store about 10.10pm and demanded money from employees.
After they handed it over, he ran away and was last seen heading down the alleyway between Domino's Pizza and Pizza Capers.
The offender was described as Caucasian and in his 20s.
He wore a scarf of white material across his face to conceal his identity during the robbery.
Police are urging any witness or anyone with information to contact CrimeStoppers on 1800 333 000, or via www.act.crimestoppers.com.au.