diff --git a/bn_mp_prime_is_prime.c b/bn_mp_prime_is_prime.c
index d341563..4ad3659 100644
--- a/bn_mp_prime_is_prime.c
+++ b/bn_mp_prime_is_prime.c
@@ -248,7 +248,7 @@ int mp_prime_is_prime(const mp_int *a, int t, int *result)
        * Hence the ugly type-fiddling in the following code.
        */
       size_a = mp_count_bits(a);
-      mask = (1u << floor_ilog2(size_a)) - 1u;
+      mask = (1u << s_floor_ilog2(size_a)) - 1u;
       /*
          Assuming the General Rieman hypothesis (never thought to write that in a
          comment) the upper bound can be lowered to  2*(log a)^2.
diff --git a/bn_mp_prime_strong_lucas_selfridge.c b/bn_mp_prime_strong_lucas_selfridge.c
index 9835df7..c1c77a2 100644
--- a/bn_mp_prime_strong_lucas_selfridge.c
+++ b/bn_mp_prime_strong_lucas_selfridge.c
@@ -294,7 +294,7 @@ int mp_prime_strong_lucas_selfridge(const mp_int *a, int *result)
          if ((e = mp_mul(&U2mz,&Uz,&T4z)) != MP_OKAY) {
             goto LBL_LS_ERR;
          }
-         if ((e = mp_mul_si(&T4z,(long)Ds,&T4z)) != MP_OKAY) {
+         if ((e = s_mp_mul_si(&T4z,(long)Ds,&T4z)) != MP_OKAY) {
             goto LBL_LS_ERR;
          }
          if ((e = mp_add(&T1z,&T2z,&Uz)) != MP_OKAY) {