diff --git a/include/ntapi/nt_socket.h b/include/ntapi/nt_socket.h
index 95f59e1..4b7e783 100644
--- a/include/ntapi/nt_socket.h
+++ b/include/ntapi/nt_socket.h
@@ -440,7 +440,8 @@ typedef int32_t __cdecl ntapi_sc_bind(
 
 typedef int32_t __cdecl ntapi_sc_listen(
 	__in	nt_socket *		hssocket,
-	__in	uintptr_t		backlog,
+	__in	uint32_t		backlog,
+	__in	uint32_t		afdflags	__optional,
 	__out	nt_io_status_block *	iosb		__optional);
 
 
diff --git a/src/socket/ntapi_sc_listen.c b/src/socket/ntapi_sc_listen.c
index 0fc0d87..efc9608 100644
--- a/src/socket/ntapi_sc_listen.c
+++ b/src/socket/ntapi_sc_listen.c
@@ -13,7 +13,8 @@
 
 int32_t __cdecl __ntapi_sc_listen(
 	__in	nt_socket *		hssocket,
-	__in	uintptr_t		backlog,
+	__in	uint32_t		backlog,
+	__in	uint32_t		afdflags	__optional,
 	__out	nt_io_status_block *	iosb		__optional)
 {
 	nt_afd_listen_info	afd_listen;
@@ -23,8 +24,8 @@ int32_t __cdecl __ntapi_sc_listen(
 
 	/* afd_listen */
 	afd_listen.unknown = 0;
-	afd_listen.flags   = 0;
-	afd_listen.backlog = (uint32_t)backlog;
+	afd_listen.flags   = afdflags;
+	afd_listen.backlog = backlog;
 
 	hssocket->iostatus = __ntapi->zw_device_io_control_file(
 			hssocket->hsocket,