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-rw-r--r--py/modio.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/py/modio.c b/py/modio.c
index e75432b28..b4d033238 100644
--- a/py/modio.c
+++ b/py/modio.c
@@ -44,7 +44,7 @@ extern const mp_obj_type_t mp_type_textio;
STATIC const mp_obj_type_t mp_type_iobase;
-STATIC mp_obj_base_t iobase_singleton = {&mp_type_iobase};
+STATIC const mp_obj_base_t iobase_singleton = {&mp_type_iobase};
STATIC mp_obj_t iobase_make_new(const mp_obj_type_t *type, size_t n_args, size_t n_kw, const mp_obj_t *args) {
(void)type;