diff --git a/Modules/_ctypes/cfield.c b/Modules/_ctypes/cfield.c
index f860e6e51b2468..b62d4c436384f1 100644
--- a/Modules/_ctypes/cfield.c
+++ b/Modules/_ctypes/cfield.c
@@ -1293,8 +1293,7 @@ s_set(void *ptr, PyObject *value, Py_ssize_t length)
return NULL;
}
- data = PyBytes_AS_STRING(value);
- size = strlen(data); /* XXX Why not Py_SIZE(value)? */
+ size = Py_SIZE(value);
if (size < length) {
/* This will copy the terminating NUL character
* if there is space for it.
@@ -1306,6 +1305,8 @@ s_set(void *ptr, PyObject *value, Py_ssize_t length)
size, length);
return NULL;
}
+
+ data = PyBytes_AS_STRING(value);
/* Also copy the terminating NUL character if there is space */
memcpy((char *)ptr, data, size);
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