diff --git a/drivers/s390/cio/cmf.c b/drivers/s390/cio/cmf.c
index 0df3af1f..828b2d3 100644
--- a/drivers/s390/cio/cmf.c
+++ b/drivers/s390/cio/cmf.c
@@ -1068,6 +1068,7 @@
 	if (count) {
 		interval = cmb_data->last_update -
 			cdev->private->cmb_start_time;
+		interval = (interval * 1000) >> 12;
 		interval /= count;
 	} else
 		interval = -1;