diff --git a/examples/rpl_udp/Makefile b/examples/rpl_udp/Makefile
index 2ab05c8cd0..9270b6ac75 100644
--- a/examples/rpl_udp/Makefile
+++ b/examples/rpl_udp/Makefile
@@ -27,13 +27,6 @@ CFLAGS += -DDEVELHELP
 # Change this to 0 show compiler invocation lines by default:
 QUIET ?= 1
 
-# get rid of the mandatory RPL warning
-ifeq ($(shell $(CC) -Wno-cpp -E - 2>/dev/null >/dev/null dev/null ; echo $$?),0)
-	ifeq ($(shell LANG=C $(CC) -Wno-cpp -E - 2>&1 1>/dev/null dev/null | grep warning: | grep -- -Wno-cpp),)
-		CFLAGS += -Wno-cpp
-	endif
-endif
-
 BOARD_INSUFFICIENT_RAM := chronos msb-430h redbee-econotag telosb wsn430-v1_3b wsn430-v1_4 z1 samr21-xpro
 
 # arduino-mega2560: time.h missing from avr-libc