diff --git a/core/net/rpl/rpl-conf.h b/core/net/rpl/rpl-conf.h
index 6822ff550..b86a36a85 100644
--- a/core/net/rpl/rpl-conf.h
+++ b/core/net/rpl/rpl-conf.h
@@ -242,7 +242,7 @@
 #ifdef RPL_CONF_WITH_DAO_ACK
 #define RPL_WITH_DAO_ACK RPL_CONF_WITH_DAO_ACK
 #else
-#define RPL_WITH_DAO_ACK 1
+#define RPL_WITH_DAO_ACK 0
 #endif /* RPL_CONF_WITH_DAO_ACK */
 
 /*