diff --git a/quiche/quic/core/quic_one_block_arena.h b/quiche/quic/core/quic_one_block_arena.h
index 2b28904..fb5deb3 100644
--- a/quiche/quic/core/quic_one_block_arena.h
+++ b/quiche/quic/core/quic_one_block_arena.h
@@ -70,7 +70,7 @@
 
 // QuicConnections currently use around 0.5kB of polymorphic types which would
 // ordinarily be on the heap. Instead, store them inline in an arena.
-using QuicConnectionArena = QuicOneBlockArena<320>;
+using QuicConnectionArena = QuicOneBlockArena<420>;
 
 }  // namespace quic