diff --git a/flash.h b/flash.h
index b86ec7d..f646908 100644
--- a/flash.h
+++ b/flash.h
@@ -7,6 +7,9 @@
 #define FLASH_DIRTY	0x00
 #define FLASH_ERASED	0x01
 
+/* Estimate as to how long (milliseconds) it takes to access a MB from flash */
+#define FLASH_ACCESS_MS_PER_MB		8000
+
 #include "mbox.h"
 
 int flash_dev_init(struct mbox_context *context);
diff --git a/protocol.c b/protocol.c
index c66f2df..4160e6e 100644
--- a/protocol.c
+++ b/protocol.c
@@ -5,6 +5,7 @@
 #include <errno.h>
 #include <stdint.h>
 
+#include "flash.h"
 #include "mbox.h"
 #include "lpc.h"
 #include "transport_mbox.h" /* TODO: Remove dependency on transport_mbox.h */
diff --git a/transport_mbox.h b/transport_mbox.h
index aebf3bd..8f65f7d 100644
--- a/transport_mbox.h
+++ b/transport_mbox.h
@@ -7,9 +7,6 @@
 #include "common.h"
 #include "mbox.h"
 
-/* Estimate as to how long (milliseconds) it takes to access a MB from flash */
-#define FLASH_ACCESS_MS_PER_MB		8000
-
 #define NO_BMC_EVENT			false
 #define SET_BMC_EVENT			true