diff --git a/src/packet.rs b/src/packet.rs
index 6687693d48..f80b37ac2f 100644
--- a/src/packet.rs
+++ b/src/packet.rs
@@ -20,7 +20,7 @@ pub type PacketRecycler = Recycler<Packets>;
 pub type BlobRecycler = Recycler<Blob>;
 
 pub const NUM_PACKETS: usize = 1024 * 8;
-pub const BLOB_SIZE: usize = 64 * 1024;
+pub const BLOB_SIZE: usize = (64 * 1024 - 128); // wikipedia says there should be 20b for ipv4 headers
 pub const BLOB_DATA_SIZE: usize = BLOB_SIZE - BLOB_HEADER_SIZE;
 pub const PACKET_DATA_SIZE: usize = 256;
 pub const NUM_BLOBS: usize = (NUM_PACKETS * PACKET_DATA_SIZE) / BLOB_SIZE;