diff --git a/examples/ipv6/rpl-border-router/Makefile b/examples/ipv6/rpl-border-router/Makefile
index f296b0bb3..92b2b0bf4 100644
--- a/examples/ipv6/rpl-border-router/Makefile
+++ b/examples/ipv6/rpl-border-router/Makefile
@@ -26,10 +26,12 @@ PROJECT_SOURCEFILES += slip-bridge.c
 
 WITH_WEBSERVER=1
 ifeq ($(WITH_WEBSERVER),1)
+CFLAGS += -DUIP_CONF_TCP=1
 CFLAGS += -DWEBSERVER=1
 PROJECT_SOURCEFILES += httpd-simple.c
 else ifneq ($(WITH_WEBSERVER), 0)
 APPS += $(WITH_WEBSERVER)
+CFLAGS += -DUIP_CONF_TCP=1
 CFLAGS += -DWEBSERVER=2
 endif