diff --git a/contrib/moz-script b/contrib/moz-script
index 43c884d..7708ad5 100755
--- a/contrib/moz-script
+++ b/contrib/moz-script
@@ -1,36 +1,36 @@
 #!/bin/sh
 
 # Helper script to convert to Mozilla mail format
 # Author: David Binard <binard@users.sf.net>
 
 # Taken from:  <https://sourceforge.net/p/ol2mbox/patches/4/>
 # Note: this assumes readpst was run with the -r
 # (recursive) option.
 
 
 if [ "$#" != 1 ]; then
-	echo "Usage: `basename "$0"` <folder>"
+	echo "Usage: $(basename "$0") <folder>"
 	exit 1
 fi
 
 process_dir() {
 	echo Processing directory "$1"
 	for item in "$1/"*; do
 		if [ -d "$item" ]; then
 			mv "$item" "$item.sbd"
 			touch "$item"
 			process_dir "$item.sbd"
-		elif [ "`basename \"$item\"`" = mbox ]; then
+		elif [ "$(basename "$item")" = mbox ]; then
 			mv "$item" "${item%%.sbd/mbox}"
 		else
 			echo ERROR: invalid item "$item"
 			exit 1
 		fi
 	done
 }
 
 item="$1"
 mv "$item" "$item.sbd"
 touch "$item"
 process_dir "$item.sbd"