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-rw-r--r--py/objint_mpz.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/py/objint_mpz.c b/py/objint_mpz.c
index 2353bd8d68..d818b6f407 100644
--- a/py/objint_mpz.c
+++ b/py/objint_mpz.c
@@ -116,6 +116,7 @@ mp_obj_t mp_obj_int_from_bytes_impl(bool big_endian, size_t len, const byte *buf
void mp_obj_int_to_bytes_impl(mp_obj_t self_in, bool big_endian, size_t len, byte *buf) {
assert(MP_OBJ_IS_TYPE(self_in, &mp_type_int));
mp_obj_int_t *self = MP_OBJ_TO_PTR(self_in);
+ memset(buf, 0, len);
mpz_as_bytes(&self->mpz, big_endian, len, buf);
}