diff --git a/convert_aln_format_batch_bp.pl b/convert_aln_format_batch_bp.pl
index 4b8bc49..c71c530 100755
--- a/convert_aln_format_batch_bp.pl
+++ b/convert_aln_format_batch_bp.pl
@@ -1,4 +1,4 @@
-#!/usr/bin/env perl -w
+#!/usr/bin/env -S perl -w
 
 ##########################################################################################################################
 #  convert_aln_format_batch_pb.pl  #