diff --git a/postgresql/port/_optimized/buffer.c b/postgresql/port/_optimized/buffer.c
index 7f46d2d..cb81b2f 100644
--- a/postgresql/port/_optimized/buffer.c
+++ b/postgresql/port/_optimized/buffer.c
@@ -587,7 +587,7 @@ PyTypeObject pq_message_stream_Type = {
 	sizeof(struct p_buffer),		/* tp_basicsize */
 	0,										/* tp_itemsize */
 	p_dealloc,							/* tp_dealloc */
-	NULL,									/* tp_print */
+	0,									/* tp_print */
 	NULL,									/* tp_getattr */
 	NULL,									/* tp_setattr */
 	NULL,									/* tp_compare */
diff --git a/postgresql/port/_optimized/wirestate.c b/postgresql/port/_optimized/wirestate.c
index 7947e5c..74a9aca 100644
--- a/postgresql/port/_optimized/wirestate.c
+++ b/postgresql/port/_optimized/wirestate.c
@@ -248,7 +248,7 @@ PyTypeObject WireState_Type = {
 	sizeof(struct wirestate),				/* tp_basicsize */
 	0,												/* tp_itemsize */
 	ws_dealloc,									/* tp_dealloc */
-	NULL,											/* tp_print */
+	0,											/* tp_print */
 	NULL,											/* tp_getattr */
 	NULL,											/* tp_setattr */
 	NULL,											/* tp_compare */