A method for orienting a preform of axis in a forming mold of a blowing machine, a neck of the preform being provided with at least one marker, the method including (i) installing the preform in the mold; (ii) detecting the current angular position of the preform by determining the angle of rotation through which the preform has to be rotated to reach the reference angular position thereof; and (iii) orienting the preform about the axis thereof in relation to the mold until a reference angular position is reached.