diff -r 5c249f469b81 -r ddedb71b3a85 master/mailbox.h
--- a/master/mailbox.h	Fri Nov 20 19:01:38 2009 +0100
+++ b/master/mailbox.h	Sat Nov 21 21:46:52 2009 +0100
@@ -41,6 +41,10 @@
 
 /*****************************************************************************/
 
+#define EC_MBOX_HEADER_SIZE 6
+
+/*****************************************************************************/
+
 uint8_t *ec_slave_mbox_prepare_send(const ec_slave_t *, ec_datagram_t *,
                                     uint8_t, size_t);
 int      ec_slave_mbox_prepare_check(const ec_slave_t *, ec_datagram_t *);