An isolated polypeptide having glucoamylase activity, selected from the group consisting of: (a) a polypeptide comprising an amino acid sequence having at least 80%, more preferably at least 81%, more preferably at least 82%, more preferably at least 83%, more preferably at least 84%, more preferably at least 85%, more preferably at least 86%, more preferably at least 87%, more preferably at least 88%, more preferably at least 89%, more preferably at least 90%, more preferably at least 91%, more preferably at least 92%, even more preferably at least 93%, most preferably at least 94%, and even most preferably at least 95%, such as even at least 95%, 97%, 98%, 99% or 100% identity to amino acid residues 19-573 of SEQ ID NO: 2 or SEQ ID NO: 4; (b) a polypeptide comprising an amino acid sequence having at least 80%, more preferably at least 81%, more preferably at least 82%, more preferably at least 83%, more preferably at least 84%, more preferably at least 85%, more preferably at least 86%, more preferably at least 87%, more preferably at least 88%, more preferably at least 89%, more preferably at least 90%, more preferably at least 91%, more preferably at least 92%, even more preferably at least 93%, most preferably at least 94%, and even most preferably at least 95%, such as even at least 95%, 97%, 98%, 99% or 100% identity to the catalytic domain shown as amino acids 22 to 472 of SEQ ID NO: 2 or SEQ ID NO: 4; (c) a polypeptide encoded by a polynucleotide comprising a nucleotide sequence having at least 80%, more preferably at least 81%, more preferably at least 82%, more preferably at least 83%, more preferably at least 84%, more preferably at least 85%, more preferably at least 86%, more preferably at least 87%, more preferably at least 88%, more preferably at least 89%, more preferably at least 90%, more preferably at least 91%, more preferably at least 92%, even more preferably at least 93%, most preferably at least 94%, and even most preferably at least 95%, such as even at least 95%, 97%, 98%, 99% or 100% identity to the coding sequence of SEQ ID NO: 1 or of SEQ ID NO: 3 encoding amino acids 19-573 of SEQ ID NO: 2 and SEQ ID NO: 4. (a) a polypeptide comprising an amino acid sequence having at least 80%, more preferably at least 81%, more preferably at least 82%, more preferably at least 83%, more preferably at least 84%, more preferably at least 85%, more preferably at least 86%, more preferably at least 87%, more preferably at least 88%, more preferably at least 89%, more preferably at least 90%, more preferably at least 91%, more preferably at least 92%, even more preferably at least 93%, most preferably at least 94%, and even most preferably at least 95%, such as even at least 95%, 97%, 98%, 99% or 100% identity to amino acid residues 19-573 of SEQ ID NO: 2 or SEQ ID NO: 4; (b) a polypeptide comprising an amino acid sequence having at least 80%, more preferably at least 81%, more preferably at least 82%, more preferably at least 83%, more preferably at least 84%, more preferably at least 85%, more preferably at least 86%, more preferably at least 87%, more preferably at least 88%, more preferably at least 89%, more preferably at least 90%, more preferably at least 91%, more preferably at least 92%, even more preferably at least 93%, most preferably at least 94%, and even most preferably at least 95%, such as even at least 95%, 97%, 98%, 99% or 100% identity to the catalytic domain shown as amino acids 22 to 472 of SEQ ID NO: 2 or SEQ ID NO: 4; (c) a polypeptide encoded by a polynucleotide comprising a nucleotide sequence having at least 80%, more preferably at least 81%, more preferably at least 82%, more preferably at least 83%, more preferably at least 84%, more preferably at least 85%, more preferably at least 86%, more preferably at least 87%, more preferably at least 88%, more preferably at least 89%, more preferably at least 90%, more preferably at least 91%, more preferably at least 92%, even more preferably at least 93%, most preferably at least 94%, and even most preferably at least 95%, such as even at least 95%, 97%, 98%, 99% or 100% identity to the coding sequence of SEQ ID NO: 1 or of SEQ ID NO: 3 encoding amino acids 19-573 of SEQ ID NO: 2 and SEQ ID NO: 4.