diff --git a/bacnet-stack/ports/linux/bip.c b/bacnet-stack/ports/linux/bip.c
index 1d9ffb47..eadef5a6 100644
--- a/bacnet-stack/ports/linux/bip.c
+++ b/bacnet-stack/ports/linux/bip.c
@@ -169,7 +169,7 @@ static int bip_send(
     else
         mtu[1] = 0x0A; /* Original-Unicast-NPDU */
     mtu_len = 2;
-    mtu_len += encode_unsigned16(&mtu[mtu_len], pdu_len);
+    mtu_len += encode_unsigned16(&mtu[mtu_len], pdu_len + 4 /*inclusive*/);
     memcpy(&mtu[mtu_len], pdu, pdu_len);
     mtu_len += pdu_len;