The present invention relates to a method for producing a polypeptide comprising using a variant alpha factor signal peptide having a substitution in position 9 resulting in a substitution of an A to either T, S, H, I, F, E, or G. The invention further relate to nucleic acid constructs comprising a first nucleotide sequence encoding the variant signal peptide and a second nucleotide sequence encoding a polypeptide which is foreign to the first nucleotide sequence. Furthermore, it also relates to expression vectors and host cells comprising said nuclei acid construct.