diff --git a/src/include/86box/scsi_device.h b/src/include/86box/scsi_device.h
index 289201b04..d5d620670 100644
--- a/src/include/86box/scsi_device.h
+++ b/src/include/86box/scsi_device.h
@@ -388,6 +388,7 @@ typedef struct scsi_common_s {
     void *             log;
 
     uint8_t *          temp_buffer;
+    size_t             temp_buffer_sz;
     /*
        This is atapi_cdb in ATAPI-supporting devices,
        and pad in SCSI-only devices.