  In this paper, we study the algebraic points of degree $4$ over $\mathbb{Q}$
on the Fermat curve $F_5/\mathbb{Q}$ of equation $x^5+y^5+z^5=0$. A geometrical
description of these points has been given in 1997 by Klassen and Tzermias.
Using their result, as well as Bruin's work about diophantine equations of
signature $(5,5,2)$, we give here an algebraic description of these points. In
particular, we prove there is only one Galois extension of $\mathbb{Q}$ of
degree $4$ that arises as the field of definition of a non-trivial point of
$F_5$.
