diff --git a/bash/dup-live-disk.sh b/bash/dup-live-disk.sh
index 60c14ee..ec9728d 100755
--- a/bash/dup-live-disk.sh
+++ b/bash/dup-live-disk.sh
@@ -147,6 +147,7 @@
 # command line
 SCRIPT="$0"
 CMD="${0##*/}"
+export LC_ALL=C
 
 # valid filesystems
 # shellcheck disable=2034