diff --git a/quic/quartc/quartc_factory.cc b/quic/quartc/quartc_factory.cc
index 9517e0b..436212f 100644
--- a/quic/quartc/quartc_factory.cc
+++ b/quic/quartc/quartc_factory.cc
@@ -208,6 +208,8 @@
       connection_id, peer_address, connection_helper, alarm_factory,
       packet_writer,
       /*owns_writer=*/false, perspective, supported_versions);
+  quic_connection->SetMaxPacketLength(
+      packet_writer->GetMaxPacketSize(peer_address));
 
   QuicSentPacketManager& sent_packet_manager =
       quic_connection->sent_packet_manager();