diff --git a/rpi23-gen-image.sh b/rpi23-gen-image.sh
index 6f7451c..e558790 100755
--- a/rpi23-gen-image.sh
+++ b/rpi23-gen-image.sh
@@ -835,7 +835,7 @@ if [ "$ENABLE_CRYPTFS" = true ] ; then
   echo -n ${CRYPTFS_PASSWORD} > .password
 
   # Initialize encrypted partition
-  echo "YES" | cryptsetup luksFormat "${ROOT_LOOP}" -c "${CRYPTFS_CIPHER}" -s "${CRYPTFS_XTSKEYSIZE}" .password
+  printf "YES" | cryptsetup luksFormat "${ROOT_LOOP}" -c "${CRYPTFS_CIPHER}" -s "${CRYPTFS_XTSKEYSIZE}" .password
 
   # Open encrypted partition and setup mapping
   cryptsetup luksOpen "${ROOT_LOOP}" -d .password "${CRYPTFS_MAPPING}"