diff --git a/lib/libc/sys/sigaction.2 b/lib/libc/sys/sigaction.2
index e23535a937b6..58723b815a3e 100644
--- a/lib/libc/sys/sigaction.2
+++ b/lib/libc/sys/sigaction.2
@@ -57,10 +57,8 @@ struct  sigaction {
 #define	sa_sigaction	__sigaction_u.__sa_sigaction
 .Ed
 .Ft int
-.Fo sigaction
-.Fa "int sig" "const struct sigaction * restrict act"
-.Fa "struct sigaction * restrict oact"
-.Fc
+.Fn "int sig" "const struct sigaction * restrict act" \
+    "struct sigaction * restrict oact"
 .Sh DESCRIPTION
 The system defines a set of signals that may be delivered to a process.
 Signal delivery resembles the occurrence of a hardware interrupt:
diff --git a/lib/libc/sys/sigprocmask.2 b/lib/libc/sys/sigprocmask.2
index 6cb7e4955f36..7f271be7d95b 100644
--- a/lib/libc/sys/sigprocmask.2
+++ b/lib/libc/sys/sigprocmask.2
@@ -43,9 +43,8 @@
 .Sh SYNOPSIS
 .In signal.h
 .Ft int
-.Fo sigprocmask
-.Fa "int how" "const sigset_t * restrict set" "sigset_t * restrict oset"
-.Fc
+.Fn sigprocmask "int how" "const sigset_t * restrict set" \
+    "sigset_t * restrict oset"
 .Sh DESCRIPTION
 The
 .Fn sigprocmask