diff -urN src.orig/debug.c src/debug.c
--- src.orig/debug.c	2013-10-25 03:46:27.000000000 +0300
+++ src/debug.c	2014-01-05 21:51:55.000000000 +0200
@@ -8,7 +8,7 @@
 
 #include "exim.h"
 
-static uschar  debug_buffer[2048];
+static uschar  debug_buffer[4096];
 static uschar *debug_ptr = debug_buffer;
 static int     debug_prefix_length = 0;