diff --git a/functions.php b/functions.php
index abd1f20d5..8eb6d79a6 100644
--- a/functions.php
+++ b/functions.php
@@ -2235,7 +2235,8 @@
 	function make_lockfile($filename) {
 		$fp = fopen(LOCK_DIRECTORY . "/$filename", "w");
 
-		if (flock($fp, LOCK_EX | LOCK_NB)) {		
+		if (flock($fp, LOCK_EX | LOCK_NB)) {
+			fwrite($fp, posix_getpid() . "\n");
 			return $fp;
 		} else {
 			return false;