kc3-lang/libtommath

diff --git a/bn_mp_prime_is_prime.c b/bn_mp_prime_is_prime.c
index 1afa1ae..86edcb6 100644
--- a/bn_mp_prime_is_prime.c
+++ b/bn_mp_prime_is_prime.c
@@ -105,7 +105,7 @@ mp_err mp_prime_is_prime(const mp_int *a, int t, mp_bool *result)
        * MP_8BIT (It is unknown if the Lucas-Selfridge test works with 16-bit
        * integers but the necesssary analysis is on the todo-list).
        */
-#ifdef (LTM_USE_FROBENIUS_TEST)
+#ifdef LTM_USE_FROBENIUS_TEST
       err = mp_prime_frobenius_underwood(a, &res);
       if ((err != MP_OKAY) && (err != MP_ITER)) {
          goto LBL_B;