Solid forms of N-[2,4-bis(1,1-dimethylethyl)-5-hydroxyphenyl]-1,4-dihydro-4-oxoquinoline-3-carboxamide are described herein, including crystalline forms thereof.Cette invention concerne des formes solides de N-[2,4-bis(1,1-diméthyléthyl)-5-hydroxyphényl]-1,4-dihydro-4-oxoquinoline-3-carboxamide, et leurs formes cristallines.