The boy from the western city of Aachen phoned on Monday to make his complaint, adding that his mother "made him work all day", police said.
"I have to work all day long. I haven't any free time," the boy told authorities over the phone.
His mother, who was not identified, later told police her son had been complaining over the holidays of having to help around the house, and had repeatedly threatened to call the police over such "forced labour".
When she asked him to pick up paper on the floor, he dialed the 110 police emergency number.
"He plays all day long and when told to tidy up what he's done, he calls it forced labour," police quoted his mother as saying.