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-rw-r--r--py/builtinimport.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/py/builtinimport.c b/py/builtinimport.c
index 4dc02bdc22..7a9c0864b2 100644
--- a/py/builtinimport.c
+++ b/py/builtinimport.c
@@ -203,7 +203,7 @@ mp_obj_t mp_builtin___import__(mp_uint_t n_args, const mp_obj_t *args) {
nlr_raise(mp_obj_new_exception_msg(&mp_type_ImportError, "Invalid relative import"));
}
- uint new_mod_l = (mod_len == 0 ? p - this_name : p - this_name + 1 + mod_len);
+ uint new_mod_l = (mod_len == 0 ? (size_t)(p - this_name) : (size_t)(p - this_name) + 1 + mod_len);
char *new_mod = alloca(new_mod_l);
memcpy(new_mod, this_name, p - this_name);
if (mod_len != 0) {