diff --git a/src/lib/libutil/imsg-buffer.c b/src/lib/libutil/imsg-buffer.c
index a4aee60b..7c60d9e9 100644
--- a/src/lib/libutil/imsg-buffer.c
+++ b/src/lib/libutil/imsg-buffer.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: imsg-buffer.c,v 1.11 2017/12/14 09:27:44 kettenis Exp $	*/
+/*	$OpenBSD: imsg-buffer.c,v 1.12 2019/01/20 02:50:03 bcook Exp $	*/
 
 /*
  * Copyright (c) 2003, 2004 Henning Brauer <henning@openbsd.org>
@@ -70,7 +70,7 @@ ibuf_dynamic(size_t len, size_t max)
 static int
 ibuf_realloc(struct ibuf *buf, size_t len)
 {
-	u_char	*b;
+	unsigned char	*b;
 
 	/* on static buffers max is eq size and so the following fails */
 	if (buf->wpos + len > buf->max) {
diff --git a/src/lib/libutil/imsg.h b/src/lib/libutil/imsg.h
index 8bf94147..5b092cfc 100644
--- a/src/lib/libutil/imsg.h
+++ b/src/lib/libutil/imsg.h
@@ -1,4 +1,4 @@
-/*	$OpenBSD: imsg.h,v 1.4 2017/03/24 09:34:12 nicm Exp $	*/
+/*	$OpenBSD: imsg.h,v 1.5 2019/01/20 02:50:03 bcook Exp $	*/
 
 /*
  * Copyright (c) 2006, 2007 Pierre-Yves Ritschard <pyr@openbsd.org>
@@ -21,13 +21,15 @@
 #ifndef _IMSG_H_
 #define _IMSG_H_
 
+#include <stdint.h>
+
 #define IBUF_READ_SIZE		65535
 #define IMSG_HEADER_SIZE	sizeof(struct imsg_hdr)
 #define MAX_IMSGSIZE		16384
 
 struct ibuf {
 	TAILQ_ENTRY(ibuf)	 entry;
-	u_char			*buf;
+	unsigned char		*buf;
 	size_t			 size;
 	size_t			 max;
 	size_t			 wpos;
@@ -42,8 +44,8 @@ struct msgbuf {
 };
 
 struct ibuf_read {
-	u_char			 buf[IBUF_READ_SIZE];
-	u_char			*rptr;
+	unsigned char		 buf[IBUF_READ_SIZE];
+	unsigned char		*rptr;
 	size_t			 wpos;
 };
 
diff --git a/src/lib/libutil/imsg_init.3 b/src/lib/libutil/imsg_init.3
index 30c6334f..18720d1d 100644
--- a/src/lib/libutil/imsg_init.3
+++ b/src/lib/libutil/imsg_init.3
@@ -1,4 +1,4 @@
-.\" $OpenBSD: imsg_init.3,v 1.22 2018/09/26 09:22:52 jmc Exp $
+.\" $OpenBSD: imsg_init.3,v 1.23 2019/01/20 02:50:03 bcook Exp $
 .\"
 .\" Copyright (c) 2010 Nicholas Marriott <nicm@openbsd.org>
 .\"
@@ -14,7 +14,7 @@
 .\" IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
 .\" OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 .\"
-.Dd $Mdocdate: September 26 2018 $
+.Dd $Mdocdate: January 20 2019 $
 .Dt IMSG_INIT 3
 .Os
 .Sh NAME
@@ -320,7 +320,7 @@ a queue of output buffers for transmission:
 .Bd -literal -offset indent
 struct ibuf {
 	TAILQ_ENTRY(ibuf)	 entry;
-	u_char			*buf;
+	unsigned char		*buf;
 	size_t			 size;
 	size_t			 max;
 	size_t			 wpos;