diff --git a/src/httpmessage.rs b/src/httpmessage.rs
index a8ae50edb..7f6b50c6d 100644
--- a/src/httpmessage.rs
+++ b/src/httpmessage.rs
@@ -288,7 +288,7 @@ where
     fn new(req: T) -> Self {
         Readlines {
             req,
-            buff: Vec::with_capacity(256),
+            buff: Vec::with_capacity(262_144),
             limit: 262_144,
         }
     }