diff --git a/90overlay/overlay-generator.sh b/90overlay/overlay-generator.sh
index a37c92d..280f3cf 100755
--- a/90overlay/overlay-generator.sh
+++ b/90overlay/overlay-generator.sh
@@ -12,11 +12,11 @@
 [ -z "$overlay" ] && return 0
 
 derefed=""
-function deref_dev() {
+deref_dev() {
 case "${1}" in
     block:LABEL=*|LABEL=*)
         derefed="${1#block:}"
-        derefed="$(echo $derefed | sed 's,/,\\x2f,g')"
+        derefed="$(echo "$derefed" | sed 's,/,\\x2f,g')"
         derefed="/dev/disk/by-label/${derefed#LABEL=}"
 	;;
     block:UUID=*|UUID=*)