Abstract: A fixing element has an expansion zone formed by a longitudinal slot having a trapezoidal cross-section and produced by stamping, and an expander member inserted in the longitudinal slot and displaceable therein. On the two sliding surfaces of the longitudinal slot arranged at an angle to one another the expander member rests with its two bearing surfaces, likewise arranged at an angle to one another. The external surface of the expander member provided with teeth of roof-shaped construction projects beyond the shank of the fixing element at least with a part of the height of the teeth. The expander member lying in the longitudinal slot so that it is easily displaceable allows subsequent expansion of the anchored fixing element in the event that the drilled hole widens as a result of cracks forming.