diff --git a/appliance/init b/appliance/init
index 21e7ab824..f6fe9b9c6 100755
--- a/appliance/init
+++ b/appliance/init
@@ -81,9 +81,11 @@ fi
 
 # Disk optimizations.
 # Increase the SCSI timeout so we can read remote images.
+shopt -s nullglob
 for f in /sys/block/sd*/device/timeout; do echo 300 > $f; done
 # https://access.redhat.com/site/solutions/5427
 for f in /sys/block/{h,s,ub,v}d*/queue/scheduler; do echo noop > $f; done
+shopt -u nullglob
 
 # Update the system clock.
 hwclock -u -s