diff --git a/auth-bsdauth.c b/auth-bsdauth.c
index 37ff893..e00718f 100644
--- a/auth-bsdauth.c
+++ b/auth-bsdauth.c
@@ -1,4 +1,4 @@
-/* $OpenBSD: auth-bsdauth.c,v 1.13 2014/06/24 01:13:21 djm Exp $ */
+/* $OpenBSD: auth-bsdauth.c,v 1.14 2015/10/20 23:24:25 mmcc Exp $ */
 /*
  * Copyright (c) 2001 Markus Friedl.  All rights reserved.
  *
@@ -103,7 +103,7 @@
 	if (!authctxt->valid)
 		return -1;
 
-	if (authctxt->as == 0)
+	if (authctxt->as == NULL)
 		error("bsdauth_respond: no bsd auth session");
 
 	if (numresponses != 1)