A method, an apparatus and a computer program for controlling updating of a signal quality target (405) for power control of an ongoing radio transmission (101) in a radio communication system (SYS1), wherein the signal quality target is updated based on communication quality. The method includes detecting (301) a change in transmission format from a first transmission format to a second transmission format for the radio transmission. Any updates causing the signal quality target to increase due to communication quality being below a set communication quality target are blocked (302) for a predefined blocking period after detecting said change in transmission format.