diff --git a/include/tpm-v2.h b/include/tpm-v2.h
index 737e575..2df3dad 100644
--- a/include/tpm-v2.h
+++ b/include/tpm-v2.h
@@ -105,6 +105,8 @@
 	"Exit Boot Services Returned with Failure"
 #define EFI_EXIT_BOOT_SERVICES_SUCCEEDED    \
 	"Exit Boot Services Returned with Success"
+#define EFI_DTB_EVENT_STRING \
+	"DTB DATA"
 
 /* TPMS_TAGGED_PROPERTY Structure */
 struct tpms_tagged_property {