Index: includes/ChangesFeed.php
===================================================================
--- includes/ChangesFeed.php	(revision 52495)
+++ includes/ChangesFeed.php	(working copy)
@@ -55,7 +55,7 @@
 	public function saveToCache( $feed, $timekey, $key ) {
 		global $messageMemc;
 		$expire = 3600 * 24; # One day
-		$messageMemc->set( $key, $feed );
+		$messageMemc->set( $key, $feed, $expire );
 		$messageMemc->set( $timekey, wfTimestamp( TS_MW ), $expire );
 	}