Arrangement for supporting a profile rail (30, 30') on the sill of a wall opening, wherein the profile rail (30, 30') is part of a holder for a window or door frame; the arrangement comprising: - a support element having a longitudinal axis A, an upper side, a lower side, a front end and a rear end; - a bracket; and - a profile rail (30, 30'); wherein the support element - has guide elements (15, 16) on the upper side for the profile rail (30, 30'), which are arranged parallel to the longitudinal axis A; - has an angularly designed folded edge at the front end which provides a stop face; wherein the bracket - is configured as an L-shaped component having two legs (21, 22) which form an angle of substantially 90° at the common vertex; - wherein the first leg has a connecting end with a fastening point; - and the second leg has a fastening end and one or more openings (26, 26',...) arranged on the second leg; wherein the profile rail (30, 30') is designed as a flexurally rigid, longitudinally extended profile element which is configured in cross-section as a U, C, I, double-T or as a hollow box and has webs (35, 36) which act as longitudinal stiffeners; characterized in that - the profile rail (30, 30') has an underside which is configured such that the profile rail (30, 30') can be arranged on the upper side of the support element in a longitudinally displaceable manner along the axis A; - the profile rail (30, 30') engages in a form-fitting manner in the guide elements (15, 16) of the support element; and - the connecting end of bracket and the rear end of the support element can be connected to one another in a force-fitting manner. - a support element having a longitudinal axis A, an upper side, a lower side, a front end and a rear end; - a bracket; and - a profile rail (30, 30'); wherein the support element - has guide elements (15, 16) on the upper side for the profile rail (30, 30'), which are arranged parallel to the longitudinal axis A; - has an angularly designed folded edge at the front end which provides a stop face; - has guide elements (15, 16) on the upper side for the profile rail (30, 30'), which are arranged parallel to the longitudinal axis A; - has an angularly designed folded edge at the front end which provides a stop face; wherein the bracket - is configured as an L-shaped component having two legs (21, 22) which form an angle of substantially 90° at the common vertex; - wherein the first leg has a connecting end with a fastening point; - and the second leg has a fastening end and one or more openings (26, 26',...) arranged on the second leg; - is configured as an L-shaped component having two legs (21, 22) which form an angle of substantially 90° at the common vertex; - wherein the first leg has a connecting end with a fastening point; - and the second leg has a fastening end and one or more openings (26, 26',...) arranged on the second leg; wherein the profile rail (30, 30') is designed as a flexurally rigid, longitudinally extended profile element which is configured in cross-section as a U, C, I, double-T or as a hollow box and has webs (35, 36) which act as longitudinal stiffeners; characterized in that - the profile rail (30, 30') has an underside which is configured such that the profile rail (30, 30') can be arranged on the upper side of the support element in a longitudinally displaceable manner along the axis A; - the profile rail (30, 30') engages in a form-fitting manner in the guide elements (15, 16) of the support element; and - the connecting end of bracket and the rear end of the support element can be connected to one another in a force-fitting manner. - the profile rail (30, 30') has an underside which is configured such that the profile rail (30, 30') can be arranged on the upper side of the support element in a longitudinally displaceable manner along the axis A; - the profile rail (30, 30') engages in a form-fitting manner in the guide elements (15, 16) of the support element; and - the connecting end of bracket and the rear end of the support element can be connected to one another in a force-fitting manner.