bpo-11410: Standardize and use symbol visibility attributes across POSIX and Windows. (GH-16347)
diff --git a/Modules/_io/bytesio.c b/Modules/_io/bytesio.c
index a5f4c47..b5d308a 100644
--- a/Modules/_io/bytesio.c
+++ b/Modules/_io/bytesio.c
@@ -1124,7 +1124,7 @@
(releasebufferproc) bytesiobuf_releasebuffer,
};
-PyTypeObject _PyBytesIOBuffer_Type = {
+Py_EXPORTED_SYMBOL PyTypeObject _PyBytesIOBuffer_Type = {
PyVarObject_HEAD_INIT(NULL, 0)
"_io._BytesIOBuffer", /*tp_name*/
sizeof(bytesiobuf), /*tp_basicsize*/