The present invention relates to a mutant Fibroblast Growth Factor-21 (FGF-21) peptide conjugate comprising a PEG moiety attached to a mutant FGF-21 peptide via a glycosyl linker and uses thereof. Further provided is a method for producing the mutant FGF-21 peptide conjugate and a pharmaceutical composition and container comprising said mutant FGF-21 peptide conjugate.