diff --git a/include/scsi/scsi_proto.h b/include/scsi/scsi_proto.h
index 1df8efb0ee01..c36860111932 100644
--- a/include/scsi/scsi_proto.h
+++ b/include/scsi/scsi_proto.h
@@ -236,6 +236,7 @@ struct scsi_varlen_cdb_hdr {
 #define UNIT_ATTENTION      0x06
 #define DATA_PROTECT        0x07
 #define BLANK_CHECK         0x08
+#define VENDOR_SPECIFIC     0x09
 #define COPY_ABORTED        0x0a
 #define ABORTED_COMMAND     0x0b
 #define VOLUME_OVERFLOW     0x0d