diff --git a/src/modules/_Stdio/buffer.cmod b/src/modules/_Stdio/buffer.cmod
index 41118011eebf1a88d398698c4de40d387d685ba7..43a86025f2316490ef6939e057104c1678843d55 100644
--- a/src/modules/_Stdio/buffer.cmod
+++ b/src/modules/_Stdio/buffer.cmod
@@ -33,8 +33,8 @@
 #undef MP_INT
 #include <gmp.h>
 
-#define READ_CHUNKSIZE		4096
-#define WRITE_CHUNKSIZE		4096
+#define READ_CHUNKSIZE		32768
+#define WRITE_CHUNKSIZE		32768
 
 #define DEFAULT_CMOD_STORAGE static
 DECLARATIONS