An image forming apparatus of the present disclosure includes a print queue, a job writing unit, a print execution unit, a connected-state detection unit, and a maximum-number-of-storable-pages changing unit. The print queue stores print jobs on a page basis. The job writing unit writes the print jobs into the print queue. The print execution unit executes print on a recording medium based on a page from the print queue, and suspends execution of the print in a case in which a print job other than a print job of currently executed printing is cancelled. The connected-state detection unit detects a connected state of extension devices affecting a length of a conveyance path of the recording medium. The maximum-number-of-storable-pages changing unit changes a maximum number of storable pages, that can be stored in the print queue, and changes the maximum number of storable pages, based on the connected state detected.