diff --git a/usr.bin/perror/perror.1 b/usr.bin/perror/perror.1
index 7faf77f10d9..0b724b14ca6 100644
--- a/usr.bin/perror/perror.1
+++ b/usr.bin/perror/perror.1
@@ -34,7 +34,7 @@
 .Nd "print an error number as a string"
 .Sh SYNOPSIS
 .Nm
-.Op Ar number
+.Ar number
 .Sh DESCRIPTION
 The
 .Nm