An image forming apparatus is provided. The image forming apparatus includes: a printing section configured to perform duplex printing including printing N sheet on a first side thereof and subsequently printing M sheet on a second side thereof, wherein M is equal to or smaller than N, a suspension section which is configured to suspend the duplex printing in response to receiving a request for image adjustment during the duplex printing, while the sheet having the first face thereof printed is caused to stay in the image forming apparatus during the suspension, a correction section which is configured to update a correction data for image adjustment while the duplex printing is suspended by the suspension section, and a restarting section which is configured to restart the duplex printing suspended by the suspension section after the correction data has been updated by the correction section.