diff --git a/CHANGELOG.md b/CHANGELOG.md
index ffa0501..4608786 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -20,7 +20,7 @@ System:
 * Backups can now be turned off, or stored in Amazon S3, through new control panel options.
 * Munin was not working on machines confused about their hostname.
 * SSL certificate checks were failing on OVH/OpenVZ servers due to missing /dev/stdin.
-* ownCloud updated to version 8.1.1.
+* ownCloud updated to version 8.1.1, its memcached caching enabled.
 * When upgrading, network checks like blocked port 25 are now skipped.
 * Tweaks to the intrusion detection rules for IMAP.
 * Improve the sort order of the domains in the status checks.
diff --git a/setup/owncloud.sh b/setup/owncloud.sh
index e589218..3c21a05 100755
--- a/setup/owncloud.sh
+++ b/setup/owncloud.sh
@@ -10,7 +10,7 @@ source /etc/mailinabox.conf # load global vars
 apt_install \
 	dbconfig-common \
 	php5-cli php5-sqlite php5-gd php5-imap php5-curl php-pear php-apc curl libapr1 libtool libcurl4-openssl-dev php-xml-parser \
-	php5 php5-dev php5-gd php5-fpm memcached php5-memcache unzip
+	php5 php5-dev php5-gd php5-fpm memcached php5-memcached unzip
 
 apt-get purge -qq -y owncloud*
 
@@ -102,6 +102,7 @@ if [ ! -f $STORAGE_ROOT/owncloud/owncloud.db ]; then
       'arguments'=>array('{localhost:993/imap/ssl/novalidate-cert}')
     )
   ),
+  'memcache.local' => '\\OC\\Memcache\\Memcached',
   "memcached_servers" => array (
     array('localhost', 11211),
   ),
@@ -148,6 +149,21 @@ EOF
 	(cd /usr/local/lib/owncloud; sudo -u www-data php /usr/local/lib/owncloud/index.php;)
 fi
 
+# Update existing configuration files with changed settings that weren't included in
+# previous versions of Mail-in-a-Box. Use PHP to read the settings file, modify it,
+# and write out the new settings array.
+CONFIG_TEMP=$(/bin/mktemp)
+php <<EOF > $CONFIG_TEMP && mv $CONFIG_TEMP $STORAGE_ROOT/owncloud/config.php;
+<?php
+include("$STORAGE_ROOT/owncloud/config.php");
+\$CONFIG['memcache.local'] = '\\OC\\Memcache\\Memcached';
+echo "<?php\n\\\$CONFIG = ";
+var_export(\$CONFIG);
+echo ";";
+?>
+EOF
+chown www-data.www-data $STORAGE_ROOT/owncloud/config.php
+
 # Enable/disable apps. Note that this must be done after the ownCloud setup.
 # The firstrunwizard gave Josh all sorts of problems, so disabling that.
 # user_external is what allows ownCloud to use IMAP for login. The contacts
diff --git a/setup/system.sh b/setup/system.sh
index 84f6bd8..2d929f9 100755
--- a/setup/system.sh
+++ b/setup/system.sh
@@ -48,7 +48,7 @@ apt_get_quiet upgrade
 # * netcat-openbsd: `nc` command line networking tool
 # * git: we install some things directly from github
 # * sudo: allows privileged users to execute commands as root without being root
-# * coreutils: includes `nproc` tool to report number of processors
+# * coreutils: includes `nproc` tool to report number of processors, mktemp
 # * bc: allows us to do math to compute sane defaults
 
 apt_install python3 python3-dev python3-pip \