diff --git a/bootstrap/bootstrap.sh b/bootstrap/bootstrap.sh
index 06ee558..09c2a8d 100755
--- a/bootstrap/bootstrap.sh
+++ b/bootstrap/bootstrap.sh
@@ -61,7 +61,7 @@ curl -L "$ISO_URL" --output /mnt/scratch/win.iso
 chk_fail $?
 
 announce "Verifying ISO"
-echo "$ISO_HASH  /mnt/scratch/win.iso" | sha256sum -c -
+echo "$ISO_HASH" | tr [[:upper:]] [[:lower:]] | xargs -I{} echo "{}  /mnt/scratch/win.iso" | sha256sum -c -
 chk_fail $?
 
 announce "Mounting ISO"