diff --git a/mysqlbu-scripts.sh b/mysqlbu-scripts.sh
index 2807c01..618eb1f 100755
--- a/mysqlbu-scripts.sh
+++ b/mysqlbu-scripts.sh
@@ -51,7 +51,7 @@ DELETE_BACKUP() {
 		tba=`expr $tba + 1`
 	done
 	
-	sbu1=$tbus[$1]
+	sbu1=${tbus[$1]}
 	thr=`echo ${sbu1//_BASE/} | sed 's/.*\///'`
 	bsz=`du -sh ${thr} | awk '{print $1}'`