diff --git a/share/examples/ppp/ppp.conf.sample b/share/examples/ppp/ppp.conf.sample
index 31e1e7904ec4..eff269a44208 100644
--- a/share/examples/ppp/ppp.conf.sample
+++ b/share/examples/ppp/ppp.conf.sample
@@ -187,8 +187,8 @@ examples:
 # If we're using the -nat switch, redirect ftp and http to an internal
 # machine:
 #
-    nat port 10.0.0.2:ftp ftp
-    nat port 10.0.0.2:http http
+    nat port tcp 10.0.0.2:ftp ftp
+    nat port tcp 10.0.0.2:http http
 #
 # or don't trust the outside at all
 #