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-rw-r--r--src/libstd/rt/io/mem.rs2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/libstd/rt/io/mem.rs b/src/libstd/rt/io/mem.rs
index c93945a6a9a..277897e5d2e 100644
--- a/src/libstd/rt/io/mem.rs
+++ b/src/libstd/rt/io/mem.rs
@@ -26,7 +26,7 @@ pub struct MemWriter {
 }
 
 impl MemWriter {
-    pub fn new() -> MemWriter { MemWriter { buf: ~[] } }
+    pub fn new() -> MemWriter { MemWriter { buf: vec::with_capacity(128) } }
 }
 
 impl Writer for MemWriter {