diff --git a/gen_iso.perl b/gen_iso.perl
index e1873fd..55fab31 100644
--- a/gen_iso.perl
+++ b/gen_iso.perl
@@ -6,6 +6,7 @@ use warnings;
 sub update_iso_directory {
     my ($directory_path) = @_;
     chdir($directory_path);
+    system('git' 'checkout' '.');
     system('git', 'pull');
 }