diff --git a/framework/Imap_Client/lib/Horde/Imap/Client/Cache/Backend/Cache.php b/framework/Imap_Client/lib/Horde/Imap/Client/Cache/Backend/Cache.php
index 817b4852eb8..f2d1a3b2c4f 100644
--- a/framework/Imap_Client/lib/Horde/Imap/Client/Cache/Backend/Cache.php
+++ b/framework/Imap_Client/lib/Horde/Imap/Client/Cache/Backend/Cache.php
@@ -151,7 +151,7 @@ public function save()
             }
 
             if (!empty($val['slicemap'])) {
-                $this->_cache->set($this->_getCid($mbox, 'slicemap'), serialize($s), $lifetime);
+                $this->_cache->set($this->_getCid($mbox, 'slicemap'), serialize($s), 0);
             }
         }
 
diff --git a/framework/Imap_Client/package.xml b/framework/Imap_Client/package.xml
index 4cffd6b88b5..760c7ef23d9 100644
--- a/framework/Imap_Client/package.xml
+++ b/framework/Imap_Client/package.xml
@@ -21,6 +21,7 @@
  </stability>
  <license uri="http://www.horde.org/licenses/lgpl21">LGPL-2.1</license>
  <notes>
+* [mms] Set infinite lifetime for the cache metadata for the Horde_Cache caching backend.
 * [mms] The Hashtable cache driver now allows the lifetime of the message data to be specified.
 * [mms] Fix removing UID from cached list in Hashtable cache driver if the message data no longer exists.
 * [mms] Add &apos;force_map&apos; option to Horde_Imap_Client_Base#copy() to guarantee that the mapping array is always returned.
@@ -2285,6 +2286,7 @@
    <date>2014-03-05</date>
    <license uri="http://www.horde.org/licenses/lgpl21">LGPL-2.1</license>
    <notes>
+* [mms] Set infinite lifetime for the cache metadata for the Horde_Cache caching backend.
 * [mms] The Hashtable cache driver now allows the lifetime of the message data to be specified.
 * [mms] Fix removing UID from cached list in Hashtable cache driver if the message data no longer exists.
 * [mms] Add &apos;force_map&apos; option to Horde_Imap_Client_Base#copy() to guarantee that the mapping array is always returned.