diff --git a/liteeth/common.py b/liteeth/common.py
index 9206d9c..a765623 100644
--- a/liteeth/common.py
+++ b/liteeth/common.py
@@ -24,7 +24,7 @@ class Port:
         return r
 
 
-eth_mtu = 1532
+eth_mtu = 1530
 eth_min_len = 46
 eth_interpacket_gap = 12
 eth_preamble = 0xd555555555555555