diff --git a/phpBB/adm/style/acp_forums.html b/phpBB/adm/style/acp_forums.html
index e8b20007dc..4a534d0592 100644
--- a/phpBB/adm/style/acp_forums.html
+++ b/phpBB/adm/style/acp_forums.html
@@ -278,6 +278,19 @@
 			<dd><label><input type="radio" class="radio" name="prune_sticky" value="1"<!-- IF S_PRUNE_STICKY --> id="prune_sticky" checked="checked"<!-- ENDIF --> /> {L_YES}</label>
 				<label><input type="radio" class="radio" name="prune_sticky" value="0"<!-- IF not S_PRUNE_STICKY --> id="prune_sticky" checked="checked"<!-- ENDIF --> /> {L_NO}</label></dd>
 		</dl>
+		<dl>
+			<dt><label for="enable_shadow_topic_prune">{L_FORUM_PRUNE_SHADOW_TOPICS}{L_COLON}</label><br /><span>{L_FORUM_PRUNE_SHADOW_TOPICS_EXPLAIN}</span></dt>
+			<dd><label><input type="radio" class="radio" name="enable_shadow_topic_prune" value="1"<!-- IF S_PRUNE_ENABLE --> id="enable_shadow_topic_prune" checked="checked"<!-- ENDIF --> /> {L_YES}</label>
+				<label><input type="radio" class="radio" name="enable_shadow_topic_prune" value="0"<!-- IF not S_PRUNE_ENABLE --> id="enable_shadow_topic_prune" checked="checked"<!-- ENDIF --> /> {L_NO}</label></dd>
+		</dl>
+		<dl>
+			<dt><label for="prune_shadow_topic_freq">{L_AUTO_PRUNE_FREQ}{L_COLON}</label><br /><span>{L_AUTO_PRUNE_FREQ_EXPLAIN}</span></dt>
+			<dd><input type="number" id="prune_shadow_topic_freq" name="prune_shadow_topic_freq" value="{PRUNE_FREQ}" maxlength="4" size="4" min="0" max="9999" /> {L_DAYS}</dd>
+		</dl>
+		<dl>
+			<dt><label for="prune_shadow_topic_days">{L_AUTO_PRUNE_DAYS}{L_COLON}</label><br /><span>{L_AUTO_PRUNE_DAYS_EXPLAIN}</span></dt>
+			<dd><input type="number" id="prune_shadow_topic_days" name="prune_shadow_topic_days" value="{PRUNE_DAYS}" maxlength="4" size="4" min="0" max="9999" /> {L_DAYS}</dd>
+		</dl>
 		</fieldset>
 	</div>
 
diff --git a/phpBB/includes/acp/acp_forums.php b/phpBB/includes/acp/acp_forums.php
index a1af8c489d..4cefc04608 100644
--- a/phpBB/includes/acp/acp_forums.php
+++ b/phpBB/includes/acp/acp_forums.php
@@ -457,6 +457,9 @@ class acp_forums
 							'prune_days'			=> 7,
 							'prune_viewed'			=> 7,
 							'prune_freq'			=> 1,
+							'enable_shadow_topic_prune'	=> false,
+							'prune_shadow_topic_days'	=> 7,
+							'prune_shadow_topic_freq'	=> 1,
 							'forum_flags'			=> FORUM_FLAG_POST_REVIEW + FORUM_FLAG_ACTIVE_TOPICS,
 							'forum_options'			=> 0,
 							'forum_password'		=> '',
diff --git a/phpBB/language/en/acp/forums.php b/phpBB/language/en/acp/forums.php
index 756cb7ae0f..f452dad8a0 100644
--- a/phpBB/language/en/acp/forums.php
+++ b/phpBB/language/en/acp/forums.php
@@ -101,6 +101,8 @@ $lang = array_merge($lang, array(
 	'FORUM_PASSWORD_OLD'				=> 'The forum password is using an old hashing method and should be changed.',
 	'FORUM_PASSWORD_MISMATCH'			=> 'The passwords you entered did not match.',
 	'FORUM_PRUNE_SETTINGS'				=> 'Forum prune settings',
+	'FORUM_PRUNE_SHADOW_TOPICS'			=> 'Enable auto-pruning of shadow topics',
+	'FORUM_PRUNE_SHADOW_TOPICS_EXPLAIN'		=> 'Prunes the forum of shadow topics, set the frequency/age parameters below.',
 	'FORUM_RESYNCED'					=> 'Forum “%s” successfully resynced',
 	'FORUM_RULES_EXPLAIN'				=> 'Forum rules are displayed at any page within the given forum.',
 	'FORUM_RULES_LINK'					=> 'Link to forum rules',
diff --git a/phpBB/phpbb/db/migration/data/v310/prune_shadow_topics.php b/phpBB/phpbb/db/migration/data/v310/prune_shadow_topics.php
new file mode 100644
index 0000000000..0aca897946
--- /dev/null
+++ b/phpBB/phpbb/db/migration/data/v310/prune_shadow_topics.php
@@ -0,0 +1,44 @@
+<?php
+/**
+*
+* @package migration
+* @copyright (c) 2014 phpBB Group
+* @license http://opensource.org/licenses/gpl-license.php GNU Public License v2
+*
+*/
+
+namespace phpbb\db\migration\data\v310;
+
+class prune_shadow_topics extends \phpbb\db\migration\migration
+{
+	static public function depends_on()
+	{
+		return array('\phpbb\db\migration\data\v310\dev');
+	}
+
+	public function update_schema()
+	{
+		return array(
+			'add_columns'		=> array(
+				$this->table_prefix . 'forums'		=> array(
+					'enable_shadow_topic_prune'	=> array('BOOL', 0, 'after' => 'prune_freq'),
+					'prune_shadow_topic_days'	=> array('UINT', 7, 'after' => 'enable_shadow_topic_prune'),
+					'prune_shadow_topic_freq'	=> array('UINT', 1, 'after' => 'prune_shadow_topic_freq'),
+				),
+			),
+		);
+	}
+
+	public function revert_schema()
+	{
+		return array(
+			'drop_columns'		=> array(
+				$this->table_prefix . 'forums'		=> array(
+					'enable_shadow_topic_prune',
+					'prune_shadow_topic_days',
+					'prune_shadow_topic_freq',
+				),
+			),
+		);
+	}
+}