diff --git a/drivers/scsi/ibmvscsi/ibmvscsi.c b/drivers/scsi/ibmvscsi/ibmvscsi.c
index 6b24b9c..7b1502c 100644
--- a/drivers/scsi/ibmvscsi/ibmvscsi.c
+++ b/drivers/scsi/ibmvscsi/ibmvscsi.c
@@ -1636,7 +1636,7 @@
 	unsigned long desired_io = max_requests * sizeof(union viosrp_iu);
 
 	/* add io space for sg data */
-	desired_io += (IBMVSCSI_MAX_SECTORS_DEFAULT *
+	desired_io += (IBMVSCSI_MAX_SECTORS_DEFAULT * 512 *
 	                     IBMVSCSI_CMDS_PER_LUN_DEFAULT);
 
 	return desired_io;