diff --git a/usr.bin/m4/m4.1 b/usr.bin/m4/m4.1
index 32a984aa32ad..4c566d8eda33 100644
--- a/usr.bin/m4/m4.1
+++ b/usr.bin/m4/m4.1
@@ -1,4 +1,4 @@
-.\"	$NetBSD: m4.1,v 1.16 2003/06/26 18:14:21 wiz Exp $
+.\"	$NetBSD: m4.1,v 1.17 2003/06/26 18:14:41 wiz Exp $
 .\"	@(#) $OpenBSD: m4.1,v 1.23 2001/09/29 11:56:18 espie Exp $
 .\"
 .\"
@@ -358,7 +358,7 @@ The
 .Fl s
 option
 .Po
-.Xr cpp 1 's
+.Xr cpp 1 Ns 's
 #line directives
 .Pc
 is currently not supported.