diff --git a/examples/echo-plain.rkt b/examples/echo-plain.rkt
index 6fb0b1d..9625f78 100644
--- a/examples/echo-plain.rkt
+++ b/examples/echo-plain.rkt
@@ -14,6 +14,6 @@
 	(send-message (tcp-channel to from data))]))))
 
 (ground-vm tcp
-	   (subscriber (tcp-channel ? (tcp-listener 5999) ?)
+	   (observe-publishers (tcp-channel ? (tcp-listener 5999) ?)
 	     (match-conversation (tcp-channel from to _)
 	       (on-presence (spawn (echoer from to))))))