diff --git a/mitogen/core.py b/mitogen/core.py
index a132c170..696b89ea 100644
--- a/mitogen/core.py
+++ b/mitogen/core.py
@@ -67,7 +67,7 @@ ALLOCATE_ID = 104
 SHUTDOWN = 105
 LOAD_MODULE = 106
 
-CHUNK_SIZE = 16384
+CHUNK_SIZE = 131072
 _tls = threading.local()