diff --git a/cpu/mc1322x/lib/maca.c b/cpu/mc1322x/lib/maca.c
index 46c882463..3dc03203c 100644
--- a/cpu/mc1322x/lib/maca.c
+++ b/cpu/mc1322x/lib/maca.c
@@ -72,6 +72,10 @@
 #define CPL_TIMEOUT (2*128*CLK_PER_BYTE) 
 #endif
 
+#ifndef MACA_INSERT_ACK
+#define MACA_INSERT_ACK 1
+#endif
+
 #define reg(x) (*(volatile uint32_t *)(x))
 
 int count_packets(void);
diff --git a/platform/redbee-econotag/contiki-conf.h b/platform/redbee-econotag/contiki-conf.h
index 92c2ef1b3..1a04ba49a 100644
--- a/platform/redbee-econotag/contiki-conf.h
+++ b/platform/redbee-econotag/contiki-conf.h
@@ -85,6 +85,7 @@
 #define USE_32KHZ_XTAL              0
 
 #define BLOCKING_TX 1
+#define MACA_AUTOACK 1
 #define NULLRDC_CONF_802154_AUTOACK_HW 1
 
 #define USE_WDT 0