diff --git a/wolfcrypt/src/integer.c b/wolfcrypt/src/integer.c
index a4fc5f6ca..b2eafb4cc 100644
--- a/wolfcrypt/src/integer.c
+++ b/wolfcrypt/src/integer.c
@@ -5229,9 +5229,11 @@ int mp_read_radix (mp_int * a, const char *str, int radix)
      */
     if (y < radix) {
       if ((res = mp_mul_d (a, (mp_digit) radix, a)) != MP_OKAY) {
+         mp_zero(a);
          return res;
       }
       if ((res = mp_add_d (a, (mp_digit) y, a)) != MP_OKAY) {
+         mp_zero(a);
          return res;
       }
     } else {