diff --git a/singleTrimSP.cgi b/singleTrimSP.cgi
index 35bb3ca..c223bad 100644
--- a/singleTrimSP.cgi
+++ b/singleTrimSP.cgi
@@ -459,7 +459,8 @@ if ($filename =~ /_Seq_Results\.dat$/) {
 	if ($ok) {
 	    my $command = "tar -czf " . shell_quote($archive_path)
 		. " -C " . shell_quote($work_path)
-		. " . >> " . shell_quote($logfile) . " 2>&1";
+		. " --exclude=./.trimsp-lock . "
+		. ">> " . shell_quote($logfile) . " 2>&1";
 	    append_log($logfile, "\n[archive] \$ $command\n");
 	    my $result = run_bounded_command($command);
 	    ($exit_code, my $completion) = describe_result($result);