An image forming apparatus includes a fixing device, a number-of-revolutions determining unit, and a stopping unit. The fixing device includes a toner image forming unit that forms a toner image, a fixing member that fixes toner to a recording medium, a pressure member that conveys the recording medium, a driving unit that rotates the pressure member to allow the fixing member to perform slave rotation, and a number-of-revolutions sensing unit that senses the number of revolutions of the fixing member. The number-of-revolutions determining unit determines, based on the number of revolutions of the fixing member sensed by the number-of-revolutions sensing unit, the number of revolutions of the driving unit. The stopping unit stops the driving unit when the number of revolutions determined by the number-of-revolutions determining unit is not equal to a specific number of revolutions.