A dosing cap for a container for dosing free-flowing solid materials, comprising a covering plate with an opening for removing the solid materials from the container, wherein an inside surface of the covering plate is directed to an inside of the container, wherein the covering plate at its inside surface is provided with a labyrinth providing a flow path for the solid materials towards the opening; said labyrinth being defined by a box (6; 16) comprising a bottom and walls (18, 19, 20) extending from said bottom; wherein the box walls (18, 19, 20) comprises a box lateral wall, box side walls and a box wall, wherein the dosing cap comprises at the covering plate's inside surface and extending therefrom, closing walls (12, 13, 14) along the opening's circumference, the box (6; 16) covering the closing walls (12, 13, 14), and wherein - a first closing wall is functioning as dosing wall, - a lateral closing wall is being positioned at an opposite side of the opening, and - closing side walls are connecting the dosing wall and the lateral closing wall, - the dosing wall is provided extending from a position at the covering plate's inside surface at a position between said opening and said box wall, said dosing wall is extending towards the box's bottom and ending at a distance from said bottom, said dosing wall is extending between opposing portions of said box's side walls; characterized in that said box (6; 16) is hingedly coupled to said covering plate, and in that said box is movable between a first position and a second position, wherein in the first position the box's walls (18, 19, 20) are situated close to the covering plate and wherein in the second position the box's walls (18, 19, 20) are situated away from the covering plate, such that at least part of the box's lateral wall closely abuts the lateral closing wall, at least part of the box's side walls closely abuts the closing side walls and box wall is at a position away from the opening and from the dosing wall leaving a flow path along the dosing wall. wherein an inside surface of the covering plate is directed to an inside of the container, wherein the covering plate at its inside surface is provided with a labyrinth providing a flow path for the solid materials towards the opening; said labyrinth being defined by a box (6; 16) comprising a bottom and walls (18, 19, 20) extending from said bottom; wherein the box walls (18, 19, 20) comprises a box lateral wall, box side walls and a box wall, wherein the dosing cap comprises at the covering plate's inside surface and extending therefrom, closing walls (12, 13, 14) along the opening's circumference, the box (6; 16) covering the closing walls (12, 13, 14), and wherein - a first closing wall is functioning as dosing wall, - a lateral closing wall is being positioned at an opposite side of the opening, and - closing side walls are connecting the dosing wall and the lateral closing wall, - the dosing wall is provided extending from a position at the covering plate's inside surface at a position between said opening and said box wall, said dosing wall is extending towards the box's bottom and ending at a distance from said bottom, said dosing wall is extending between opposing portions of said box's side walls; - a first closing wall is functioning as dosing wall, - a lateral closing wall is being positioned at an opposite side of the opening, and - closing side walls are connecting the dosing wall and the lateral closing wall, - the dosing wall is provided extending from a position at the covering plate's inside surface at a position between said opening and said box wall, said dosing wall is extending towards the box's bottom and ending at a distance from said bottom, said dosing wall is extending between opposing portions of said box's side walls; characterized in that said box (6; 16) is hingedly coupled to said covering plate, and in that said box is movable between a first position and a second position, wherein in the first position the box's walls (18, 19, 20) are situated close to the covering plate and wherein in the second position the box's walls (18, 19, 20) are situated away from the covering plate, such that at least part of the box's lateral wall closely abuts the lateral closing wall, at least part of the box's side walls closely abuts the closing side walls and box wall is at a position away from the opening and from the dosing wall leaving a flow path along the dosing wall.