diff --git a/bin/dd/dd.1 b/bin/dd/dd.1
index a166dafa3171..588b62f95b9b 100644
--- a/bin/dd/dd.1
+++ b/bin/dd/dd.1
@@ -378,5 +378,5 @@ operand and the
 and
 .Cm oldibm
 values are extensions to the
-\*[Px]
+.Tn POSIX
 standard.
diff --git a/bin/expr/expr.1 b/bin/expr/expr.1
index 80c5c62c5c6f..fd54a2a68999 100644
--- a/bin/expr/expr.1
+++ b/bin/expr/expr.1
@@ -141,7 +141,7 @@ Unless
 compatibility is enabled, this version of
 .Nm
 adheres to the
-\*[Px]
+.Tn POSIX
 Utility Syntax Guidelines, which require that a leading argument beginning
 with a minus sign be considered an option to the program.
 The standard
diff --git a/share/man/man4/lomac.4 b/share/man/man4/lomac.4
index 0a649d7c7b01..fcadb5ede774 100644
--- a/share/man/man4/lomac.4
+++ b/share/man/man4/lomac.4
@@ -44,7 +44,8 @@
 The
 .Nm
 module provides a drop-in security mechanism in addition to the traditional
-\*[Px] UID-based security facilities, requiring no additional configuration
+.Tn POSIX
+UID-based security facilities, requiring no additional configuration
 from the administrator.
 .Nm
 aims to be two things: it is non-intrusive, so that the system with
diff --git a/share/man/man7/clocks.7 b/share/man/man7/clocks.7
index f7f327394c26..7ab540707368 100644
--- a/share/man/man7/clocks.7
+++ b/share/man/man7/clocks.7
@@ -66,7 +66,8 @@ in new programs under
 .Fx .
 It is feeble compared with
 .Xr getrusage 2 .
-It is provided for \*[Ai]
+It is provided for
+.Tn ANSI
 conformance.
 It is implemented by calling
 .Xr getrusage 2
@@ -91,7 +92,8 @@ It is feeble compared with
 .Xr gettimeofday 2
 together with
 .Xr getrusage 2 .
-It is provided for \*[Px]
+It is provided for
+.Tn POSIX
 conformance.
 It is implemented by calling
 .Xr gettimeofday 2
diff --git a/share/man/man9/style.9 b/share/man/man9/style.9
index d669b3b34d35..fabb1a4f1b27 100644
--- a/share/man/man9/style.9
+++ b/share/man/man9/style.9
@@ -311,7 +311,8 @@ When convention requires a
 make its name match the struct tag.
 Avoid typedefs ending in
 .Dq Li _t ,
-except as specified in Standard C or by \*[Px].
+except as specified in Standard C or by
+.Tn POSIX .
 .Bd -literal
 /* Make the structure name match the typedef. */
 typedef	struct bar {
diff --git a/usr.bin/at/at.man b/usr.bin/at/at.man
index c3e6b809a2f6..504f2946abba 100644
--- a/usr.bin/at/at.man
+++ b/usr.bin/at/at.man
@@ -129,7 +129,9 @@ and to run a job at 1am tomorrow, use
 .Pp
 The
 .Nm at
-utility also supports the \*[Px] time format (see
+utility also supports the
+.Tn POSIX
+time format (see
 .Fl t
 option).
 .Pp