diff --git a/sys/sys/ata.h b/sys/sys/ata.h
index a08d5253578f..7ec4526be7df 100644
--- a/sys/sys/ata.h
+++ b/sys/sys/ata.h
@@ -46,6 +46,7 @@ struct ata_params {
 #define ATA_ATAPI_TYPE_TAPE             0x0100  /* streaming tape */
 #define ATA_ATAPI_TYPE_CDROM            0x0500  /* CD-ROM device */
 #define ATA_ATAPI_TYPE_OPTICAL          0x0700  /* optical disk */
+#define ATA_ATAPI_REMOVABLE             0x0080
 #define ATA_DRQ_MASK                    0x0060
 #define ATA_DRQ_SLOW                    0x0000  /* cpu 3 ms delay */
 #define ATA_DRQ_INTR                    0x0020  /* interrupt 10 ms delay */