Fix merge breakage.
diff --git a/Include/bytesobject.h b/Include/bytesobject.h
index a649d39..f1e01d1 100644
--- a/Include/bytesobject.h
+++ b/Include/bytesobject.h
@@ -42,7 +42,7 @@
 
 /* Macros, trading safety for speed */
 #define PyBytes_AS_STRING(self) (assert(PyBytes_Check(self)),((PyBytesObject *)(self))->ob_bytes)
-#define PyBytes_GET_SIZE(self)  (assert(PyBytes_Check(self)),((PyBytesObject *)(self))->ob_size)
+#define PyBytes_GET_SIZE(self)  (assert(PyBytes_Check(self)),Py_Size(self))
 
 #ifdef __cplusplus
 }