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-rw-r--r--unix/file.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/unix/file.c b/unix/file.c
index b81111afdd..398aac0759 100644
--- a/unix/file.c
+++ b/unix/file.c
@@ -83,7 +83,7 @@ static mp_obj_t fdfile_make_new(mp_obj_t type_in, int n_args, const mp_obj_t *ar
o->fd = open(fname, mode, 0644);
if (o->fd == -1) {
- nlr_jump(mp_obj_new_exception_msg_1_arg(MP_QSTR_OSError, "[Errno %d]", (const char *)errno));
+ nlr_jump(mp_obj_new_exception_msg_1_arg(MP_QSTR_OSError, "[Errno %d]", (const char *)(machine_int_t)errno));
}
return o;
}