diff --git a/wolfcrypt/src/integer.c b/wolfcrypt/src/integer.c
index fad07663e..4f87ab2e0 100644
--- a/wolfcrypt/src/integer.c
+++ b/wolfcrypt/src/integer.c
@@ -4716,14 +4716,14 @@ int mp_prime_is_prime (mp_int * a, int t, int *result)
   }
 
   if (mp_isone(a)) {
-      *result = 0;
+      *result = MP_NO;
       return MP_OKAY;
   }
 
   /* is the input equal to one of the primes in the table? */
   for (ix = 0; ix < PRIME_SIZE; ix++) {
       if (mp_cmp_d(a, ltm_prime_tab[ix]) == MP_EQ) {
-         *result = 1;
+         *result = MP_YES;
          return MP_OKAY;
       }
   }