diff --git a/lib/libc/stdlib/getopt_long.3 b/lib/libc/stdlib/getopt_long.3
index f8bb1f1b6b1..d6998d13822 100644
--- a/lib/libc/stdlib/getopt_long.3
+++ b/lib/libc/stdlib/getopt_long.3
@@ -217,7 +217,7 @@ an error and return
 Specifying
 .Ql \&:
 in
-.Fa optstr
+.Fa optstring
 will cause the error message to be suppressed and
 .Ql \&:
 to be returned instead.
@@ -229,7 +229,7 @@ a leading
 or
 .Ql \&-
 in
-.Fa optstr
+.Fa optstring
 also has special meaning.
 If either of these are specified, they must appear before
 .Ql \&: .