diff --git a/man3/cmsg.3 b/man3/cmsg.3
index 2ae73ddcd..fd2542af9 100644
--- a/man3/cmsg.3
+++ b/man3/cmsg.3
@@ -80,11 +80,11 @@ returns the number of bytes an ancillary element with payload of the
 passed data length occupies.
 This is a constant expression.
 .PP
-.B CMSG_DATA
+.BR CMSG_DATA ()
 returns a pointer to the data portion of a
 .IR cmsghdr .
 .PP
-.B CMSG_LEN
+.BR CMSG_LEN ()
 returns the value to store in the
 .I cmsg_len
 member of the
@@ -105,7 +105,7 @@ Use
 on the
 .I msghdr
 to get the first control message and
-.B CMSG_NEXTHDR
+.BR CMSG_NEXTHDR ()
 to get all subsequent ones.
 In each control message, initialize
 .I cmsg_len
@@ -137,7 +137,7 @@ member of the
 .SH "CONFORMING TO"
 This ancillary data model conforms to the POSIX.1g draft, 4.4BSD-Lite,
 the IPv6 advanced API described in RFC\ 2292 and the SUSv2.
-.B CMSG_ALIGN
+.BR CMSG_ALIGN ()
 is a Linux extension.
 .SH NOTES
 For portability, ancillary data should be accessed only using the macros
@@ -146,8 +146,8 @@ described here.
 is a Linux extension and should be not used in portable programs.
 .PP
 In Linux,
-.BR CMSG_LEN ,
-.BR CMSG_DATA ,
+.BR CMSG_LEN (),
+.BR CMSG_DATA (),
 and
 .BR CMSG_ALIGN ()
 are constant expressions (assuming their argument is constant);