diff --git a/core/net/sicslowpan.c b/core/net/sicslowpan.c
index ff79f46d8..78bc0dceb 100644
--- a/core/net/sicslowpan.c
+++ b/core/net/sicslowpan.c
@@ -72,7 +72,6 @@
 
 #include <stdio.h>
 
-#undef DEBUG
 #define DEBUG DEBUG_NONE
 #include "net/uip-debug.h"
 #if DEBUG