diff --git a/platform/zoul/contiki-conf.h b/platform/zoul/contiki-conf.h
index 52cd22dfd..2c2bcb854 100644
--- a/platform/zoul/contiki-conf.h
+++ b/platform/zoul/contiki-conf.h
@@ -101,7 +101,9 @@ typedef uint32_t rtimer_clock_t;
  *
  * @{
  */
+#ifndef COFFEE_CONF_SIZE
 #define COFFEE_CONF_SIZE            (4 * COFFEE_SECTOR_SIZE)
+#endif
 /** @} */
 /*---------------------------------------------------------------------------*/
 /**