diff --git a/drivers/scsi/stex.c b/drivers/scsi/stex.c
index f308a030882916aed13c1805ef9213758e1313eb..3790906a77d10c06705b3616a22c5650d50f1948 100644
--- a/drivers/scsi/stex.c
+++ b/drivers/scsi/stex.c
@@ -467,7 +467,7 @@ stex_slave_alloc(struct scsi_device *sdev)
 	/* Cheat: usually extracted from Inquiry data */
 	sdev->tagged_supported = 1;
 
-	scsi_activate_tcq(sdev, sdev->host->can_queue);
+	scsi_activate_tcq(sdev, ST_CMD_PER_LUN);
 
 	return 0;
 }