diff --git a/examples/riot/coap_federated/sender/Makefile b/examples/riot/coap_federated/sender/Makefile
index ee01b203..6bfe90d3 100755
--- a/examples/riot/coap_federated/sender/Makefile
+++ b/examples/riot/coap_federated/sender/Makefile
@@ -16,7 +16,6 @@ DEVELHELP ?= 1
 QUIET ?= 1
 
 # Enable reactor-uc features
-# CFLAGS += -DNETWORK_CHANNEL_TCP_POSIX
 CFLAGS += -DNETWORK_CHANNEL_COAP_RIOT
 REACTION_QUEUE_SIZE = 32
 EVENT_QUEUE_SIZE = 32