diff --git a/auth-bsdauth.c b/auth-bsdauth.c
index 37ff893e6..e00718f2e 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 @@ bsdauth_respond(void *ctx, u_int numresponses, char **responses)
 	if (!authctxt->valid)
 		return -1;
 
-	if (authctxt->as == 0)
+	if (authctxt->as == NULL)
 		error("bsdauth_respond: no bsd auth session");
 
 	if (numresponses != 1)
diff --git a/monitor.c b/monitor.c
index 0af23d650..395a6f64e 100644
--- a/monitor.c
+++ b/monitor.c
@@ -1,4 +1,4 @@
-/* $OpenBSD: monitor.c,v 1.153 2015/09/04 04:44:08 djm Exp $ */
+/* $OpenBSD: monitor.c,v 1.154 2015/10/20 23:24:25 mmcc Exp $ */
 /*
  * Copyright 2002 Niels Provos <provos@citi.umich.edu>
  * Copyright 2002 Markus Friedl <markus@openbsd.org>
@@ -966,7 +966,7 @@ mm_answer_bsdauthrespond(int sock, Buffer *m)
 	char *response;
 	int authok;
 
-	if (authctxt->as == 0)
+	if (authctxt->as == NULL)
 		fatal("%s: no bsd auth session", __func__);
 
 	response = buffer_get_string(m, NULL);
@@ -1847,7 +1847,7 @@ monitor_apply_keystate(struct monitor *pmonitor)
 	sshbuf_free(child_state);
 	child_state = NULL;
 
-	if ((kex = ssh->kex) != 0) {
+	if ((kex = ssh->kex) != NULL) {
 		/* XXX set callbacks */
 #ifdef WITH_OPENSSL
 		kex->kex[KEX_DH_GRP1_SHA1] = kexdh_server;
diff --git a/sshbuf-getput-basic.c b/sshbuf-getput-basic.c
index 8ff8a0a28..23e0fd7c1 100644
--- a/sshbuf-getput-basic.c
+++ b/sshbuf-getput-basic.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: sshbuf-getput-basic.c,v 1.4 2015/01/14 15:02:39 djm Exp $	*/
+/*	$OpenBSD: sshbuf-getput-basic.c,v 1.5 2015/10/20 23:24:25 mmcc Exp $	*/
 /*
  * Copyright (c) 2011 Damien Miller
  *
@@ -131,7 +131,7 @@ sshbuf_get_string_direct(struct sshbuf *buf, const u_char **valp, size_t *lenp)
 		*lenp = 0;
 	if ((r = sshbuf_peek_string_direct(buf, &p, &len)) < 0)
 		return r;
-	if (valp != 0)
+	if (valp != NULL)
 		*valp = p;
 	if (lenp != NULL)
 		*lenp = len;
@@ -168,7 +168,7 @@ sshbuf_peek_string_direct(const struct sshbuf *buf, const u_char **valp,
 		SSHBUF_DBG(("SSH_ERR_MESSAGE_INCOMPLETE"));
 		return SSH_ERR_MESSAGE_INCOMPLETE;
 	}
-	if (valp != 0)
+	if (valp != NULL)
 		*valp = p + 4;
 	if (lenp != NULL)
 		*lenp = len;
@@ -448,7 +448,7 @@ sshbuf_get_bignum2_bytes_direct(struct sshbuf *buf,
 		d++;
 		len--;
 	}
-	if (valp != 0)
+	if (valp != NULL)
 		*valp = d;
 	if (lenp != NULL)
 		*lenp = len;