diff --git a/firmware/include/gbb_header.h b/firmware/include/gbb_header.h
index 86aa12a..c88eb1b 100644
--- a/firmware/include/gbb_header.h
+++ b/firmware/include/gbb_header.h
@@ -62,6 +62,8 @@
 #define GBB_FLAG_DISABLE_EC_SOFTWARE_SYNC 0x00000200
 /* Default to booting legacy OS when dev screen times out */
 #define GBB_FLAG_DEFAULT_DEV_BOOT_LEGACY  0x00000400
+/* Disable shutdown on lid closed */
+#define GBB_FLAG_DISABLE_LID_SHUTDOWN     0x00001000
 
 #ifdef __cplusplus
 extern "C" {