diff --git a/drivers/scsi/stex.c b/drivers/scsi/stex.c
index adda296..72f6d80 100644
--- a/drivers/scsi/stex.c
+++ b/drivers/scsi/stex.c
@@ -719,8 +719,8 @@
 
 	if (ccb->cmd->cmnd[0] == MGT_CMD &&
 		resp->scsi_status != SAM_STAT_CHECK_CONDITION) {
-		scsi_bufflen(ccb->cmd) =
-			le32_to_cpu(*(__le32 *)&resp->variable[0]);
+		scsi_set_resid(ccb->cmd, scsi_bufflen(ccb->cmd) -
+			le32_to_cpu(*(__le32 *)&resp->variable[0]));
 		return;
 	}