diff --git a/os/net/link-stats.c b/os/net/link-stats.c
index 60b107aec..fbb7677da 100644
--- a/os/net/link-stats.c
+++ b/os/net/link-stats.c
@@ -64,7 +64,7 @@
 /* ETX fixed point divisor. 128 is the value used by RPL (RFC 6551 and RFC 6719) */
 #define ETX_DIVISOR                     LINK_STATS_ETX_DIVISOR
 /* Number of Tx used to update the ETX EWMA in case of no-ACK */
-#define ETX_NOACK_PENALTY               16
+#define ETX_NOACK_PENALTY               20
 /* Initial ETX value */
 #define ETX_DEFAULT                      2