diff --git a/check_backuppc_du b/check_backuppc_du
index 110254c..96f10ee 100755
--- a/check_backuppc_du
+++ b/check_backuppc_du
@@ -137,7 +137,7 @@ foreach my $hostname ( sort(keys %Status) ) {
 	# Get aggregate of compressed used size (octets)
 	my $full_size = 0;
 	my $backups_count = 0;
-	foreach my $Backup (sort {$Backups[$a]->{num} cmp $Backups[$b]->{num}} @Backups) {
+	foreach my $Backup (sort {$a->{num} cmp $b->{num}} @Backups) {
 		if ( $full_size == 0 ) {
 			$full_size += $Backup->{sizeExistComp};
 			$full_size += $Backup->{sizeNewComp};