diff --git a/share/man/man6/intro.6 b/share/man/man6/intro.6
index 45790855ef3..f6eac24bdd7 100644
--- a/share/man/man6/intro.6
+++ b/share/man/man6/intro.6
@@ -46,7 +46,7 @@ if installed.
 You can get a short overview about all the games with the
 command:
 .Bd -literal -offset indent
-$ apropos '(6)'
+$ apropos '\\(6\\)'
 .Ed
 .Sh SEE ALSO
 .Xr intro 1 ,