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-rw-r--r--py/binary.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/py/binary.h b/py/binary.h
index a0ccbd5f43..997d878c81 100644
--- a/py/binary.h
+++ b/py/binary.h
@@ -32,7 +32,7 @@
// (underlyingly they're same).
#define BYTEARRAY_TYPECODE 0
-int mp_binary_get_size(char struct_type, char val_type, mp_uint_t *palign);
+size_t mp_binary_get_size(char struct_type, char val_type, mp_uint_t *palign);
mp_obj_t mp_binary_get_val_array(char typecode, void *p, mp_uint_t index);
void mp_binary_set_val_array(char typecode, void *p, mp_uint_t index, mp_obj_t val_in);
void mp_binary_set_val_array_from_int(char typecode, void *p, mp_uint_t index, mp_int_t val);