diff --git a/sys/net/routing/rpl/etx_beaconing.h b/sys/net/routing/rpl/etx_beaconing.h
index 44c93bbda2..b21157a6ca 100644
--- a/sys/net/routing/rpl/etx_beaconing.h
+++ b/sys/net/routing/rpl/etx_beaconing.h
@@ -16,13 +16,13 @@
 #include "debug.h"
 
 #if ENABLE_DEBUG
-#define ETX_BEACON_STACKSIZE    (4500)
-#define ETX_RADIO_STACKSIZE     (4500)
-#define ETX_CLOCK_STACKSIZE      (500)
+#define ETX_BEACON_STACKSIZE    (KERNEL_CONF_STACKSIZE_DEFAULT + KERNEL_CONF_STACKSIZE_PRINTF_FLOAT)
+#define ETX_RADIO_STACKSIZE     (KERNEL_CONF_STACKSIZE_DEFAULT + KERNEL_CONF_STACKSIZE_PRINTF_FLOAT)
+#define ETX_CLOCK_STACKSIZE     (KERNEL_CONF_STACKSIZE_DEFAULT)
 #else
-#define ETX_BEACON_STACKSIZE    (2500) //TODO optimize, maybe 2000 is enough
-#define ETX_RADIO_STACKSIZE     (2500) //TODO optimize, maybe 2000 is enough
-#define ETX_CLOCK_STACKSIZE     (500) //TODO optimize, maybe  250 is enough
+#define ETX_BEACON_STACKSIZE    (KERNEL_CONF_STACKSIZE_MAIN)
+#define ETX_RADIO_STACKSIZE     (KERNEL_CONF_STACKSIZE_MAIN)
+#define ETX_CLOCK_STACKSIZE     (KERNEL_CONF_STACKSIZE_DEFAULT)
 #endif
 
 //[option|length|ipaddr.|packetcount] with up to 15 ipaddr|packetcount pairs