Provided are an image forming apparatus and method of controlling same in which when toner replenishment from a toner accommodating unit has been performed satisfactorily, a no-toner indication can be cancelled without taking more time than necessary, and in which the status of the toner accommodating unit can be reported to the user earlier even if a toner accommodating unit that has no toner or that has malfunctioned has been installed. Whether a toner accommodating unit (5) has toner is determined based upon a detection signal from a toner density sensor (46) that detects the toner density of a developer in a developing unit (4). If it is determined that there is no toner in the toner accommodating unit (5) and the toner accommodating unit (5) is replaced, this is detected and a toner density restoration sequence for restoring the density of toner in the developing unit (4) is executed. The toner density restoration sequence is controlled based upon a predetermined target value relating to toner density restoration and a toner density restoration decision value (V1) that is different from said predetermined target value.