diff --git a/OpenSSL/py3k.h b/OpenSSL/py3k.h
index 55bcfda..dc46b43 100644
--- a/OpenSSL/py3k.h
+++ b/OpenSSL/py3k.h
@@ -13,6 +13,8 @@
 
 #else /* (PY_VERSION_HEX >= 0x03000000) */
 
+#define PyVarObject_HEAD_INIT(type, size) PyObject_HEAD_INIT(NULL) 0
+
 #define PyBytes_FromStringAndSize PyString_FromStringAndSize
 
 #define PyLong_FromLong PyInt_FromLong