diff --git a/board/reef/board.h b/board/reef/board.h
index 5f1e1b4a09..7831c90dfb 100644
--- a/board/reef/board.h
+++ b/board/reef/board.h
@@ -8,6 +8,9 @@
 #ifndef __CROS_EC_BOARD_H
 #define __CROS_EC_BOARD_H
 
+/* FIXME: Gross hack. Remove it once proto boards are obsolete. */
+#define IS_PROTO 1
+
 /*
  * Allow dangerous commands.
  * TODO: Remove this config before production.