  In this paper, we investigate the $\eta'N$ system using the three-flavor
linear sigma model including the effect of flavor SU(3) symmetry breaking. The
$\eta'N$ bound state is also found in the case including flavor symmetry
breaking and coupling with the $\eta N$ and $\pi N$ channels. The $\eta'N$
interaction becomes more attractive with the inclusion of flavor symmetry
breaking, which causes mixing between the singlet and octet scalar mesons. The
existence of such a bound state would have some impact on the $\eta'$-nucleus
system, which is of interest from both theoretical and experimental viewpoints.
