diff --git a/usr.bin/grep/grep.1 b/usr.bin/grep/grep.1
index 36fcbf86898..3168fbc45f7 100644
--- a/usr.bin/grep/grep.1
+++ b/usr.bin/grep/grep.1
@@ -265,7 +265,7 @@ Print a brief help message.
 .It Fl I
 Ignore binary files.
 This option is equivalent to the
-.Dq Fl Fl binary-file= Ns Cm without-match
+.Dq Fl Fl binary-files= Ns Cm without-match
 option.
 .It Fl i , Fl Fl ignore-case
 Perform case insensitive matching.