diff --git a/usr.sbin/config/config.8 b/usr.sbin/config/config.8
index 393f945dcd8b..efe41b0b97c6 100644
--- a/usr.sbin/config/config.8
+++ b/usr.sbin/config/config.8
@@ -164,7 +164,7 @@ This means that
 can be used to extract it from a kernel:
 to extract the configuration information, use the command
 .Pp
-.Dl "strings kernel | grep ___"
+.Dl "strings -n 3 kernel | sed -n 's/^___//p'"
 .Sh DEBUG KERNELS
 Traditional
 .Bx