diff --git a/test/book/specialized/decker-schmitt-invariant-theory/cox_ring.jlcon b/test/book/specialized/decker-schmitt-invariant-theory/cox_ring.jlcon
index 666fe4098e48..5b6a63eac415 100644
--- a/test/book/specialized/decker-schmitt-invariant-theory/cox_ring.jlcon
+++ b/test/book/specialized/decker-schmitt-invariant-theory/cox_ring.jlcon
@@ -9,7 +9,9 @@ julia> G = matrix_group(g1, g2)
 Matrix group of degree 3
   over cyclotomic field of order 3
 
-julia> chi = character_table(G)[6];
+julia> tbl = character_table(G);  F, _ = abelian_closure(QQ);
+
+julia> chi = only(x for x in tbl if order(kernel(x)[1]) == 8 && x(G(g2)) == F(z_3));
 
 julia> RG = invariant_ring(G)
 Invariant ring