We give a counterexample to the following theorem of Bremermann on Shilov boundaries: if D is a bounded domain in C-n having a univalent envelope of holomorphy, say (D) over tilde, then the Shilov boundary of D with respect to the algebra A(D), call it partial derivative D-S, coincides with the corresponding one for (D) over tilde, called partial derivative(S)(D) over tilde.