diff --git a/pibackup.sh b/pibackup.sh
index 80f1ffa..7dcd74d 100755
--- a/pibackup.sh
+++ b/pibackup.sh
@@ -56,7 +56,12 @@ if [ "$1" != "update" ]; then
 	
 	echo "$(date) - Removing old backups..."
 	allfiles=`ls -1 ${BackupDir}/*.img.gz`
-	files=(`ls -1 ${BackupDir}/*.img.gz | tail -3`)
+	
+	if [ "${BackupsToKeep}" == "" ]; then
+		BackupsToKeep=3
+	fi
+	
+	files=(`ls -1 ${BackupDir}/*.img.gz | tail -${BackupsToKeep}`)
 	for i in $allfiles; do keep=0;
 		for a in ${files[@]}; do
 			if [ $i == $a ]; then keep=1; fi;