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-rw-r--r--Modules/mmapmodule.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/Modules/mmapmodule.c b/Modules/mmapmodule.c
index 8fdf7f7..1ebccdf 100644
--- a/Modules/mmapmodule.c
+++ b/Modules/mmapmodule.c
@@ -655,7 +655,7 @@ mmap__sizeof__method(mmap_object *self, void *unused)
{
Py_ssize_t res;
- res = sizeof(mmap_object);
+ res = _PyObject_SIZE(Py_TYPE(self));
if (self->tagname)
res += strlen(self->tagname) + 1;
return PyLong_FromSsize_t(res);