diff --git a/phpBB/docs/CHANGELOG.html b/phpBB/docs/CHANGELOG.html
index bf34bea603..75d181cfcc 100644
--- a/phpBB/docs/CHANGELOG.html
+++ b/phpBB/docs/CHANGELOG.html
@@ -203,6 +203,7 @@
 		<li>[Fix] Only show &quot;Add friend&quot; and &quot;Add foe&quot; links if the specific module is enabled. (Bug #50475)</li>
 		<li>[Fix] Correctly display list items in forum description in prosilver and administration. (Bug #48055 - Patch by leviatan21)</li>
 		<li>[Fix] Fix handling of bookmarks and subscriptions on &quot;split topcis&quot;, &quot;merge topics&quot; and &quot;merge posts&quot;. (Bug #50035)</li>
+		<li>[Fix] Only embed cron.php if there is no cron lock present to reduce overhead. (Bug #45725 - Patch by TerryE)</li>
 		<li>[Change] submit_post() now accepts force_approved_state key passed to $data to indicate new posts being approved (true) or unapproved (false).</li>
 		<li>[Change] Change the data format of the default file ACM to be more secure from tampering and have better performance.</li>
 		<li>[Change] Add index on log_time to the log table to prevent slowdown on boards with many log entries. (Bug #44665 - Patch by bantu)</li>
diff --git a/phpBB/includes/functions.php b/phpBB/includes/functions.php
index 6d67f87096..f18514096f 100644
--- a/phpBB/includes/functions.php
+++ b/phpBB/includes/functions.php
@@ -4284,7 +4284,26 @@ function page_footer($run_cron = true)
 	);
 
 	// Call cron-type script
+	$call_cron = false;
 	if (!defined('IN_CRON') && $run_cron && !$config['board_disable'])
+	{
+		$call_cron = true;
+
+		// Any old lock present?
+		if (!empty($config['cron_lock']))
+		{
+			$cron_time = explode(' ', $config['cron_lock']);
+
+			// If 1 hour lock is present we do not call cron.php
+			if ($cron_time[0] + 3600 >= time())
+			{
+				$call_cron = false;
+			}
+		}
+	}
+
+	// Call cron job?
+	if ($call_cron)
 	{
 		$cron_type = '';