diff --git a/phpBB/adm/style/acp_forums.html b/phpBB/adm/style/acp_forums.html
index f8ea284acb..4243fb8005 100644
--- a/phpBB/adm/style/acp_forums.html
+++ b/phpBB/adm/style/acp_forums.html
@@ -284,11 +284,11 @@
 				<label><input type="radio" class="radio" name="enable_shadow_prune" value="0"<!-- IF not S_PRUNE_SHADOW_ENABLE --> id="enable_shadow_prune" checked="checked"<!-- ENDIF --> /> {L_NO}</label></dd>
 		</dl>
 		<dl>
-			<dt><label for="prune_shadow_freq">{L_AUTO_PRUNE_FREQ}{L_COLON}</label><br /><span>{L_AUTO_PRUNE_FREQ_EXPLAIN}</span></dt>
+			<dt><label for="prune_shadow_freq">{L_AUTO_PRUNE_SHADOW_FREQ}{L_COLON}</label><br /><span>{L_AUTO_PRUNE_SHADOW_FREQ_EXPLAIN}</span></dt>
 			<dd><input type="number" id="prune_shadow_freq" name="prune_shadow_freq" value="{PRUNE_FREQ}" maxlength="4" size="4" min="0" max="9999" /> {L_DAYS}</dd>
 		</dl>
 		<dl>
-			<dt><label for="prune_shadow_days">{L_AUTO_PRUNE_DAYS}{L_COLON}</label><br /><span>{L_AUTO_PRUNE_DAYS_EXPLAIN}</span></dt>
+			<dt><label for="prune_shadow_days">{L_AUTO_PRUNE_SHADOW_DAYS}{L_COLON}</label><br /><span>{L_AUTO_PRUNE_SHADOW_DAYS_EXPLAIN}</span></dt>
 			<dd><input type="number" id="prune_shadow_days" name="prune_shadow_days" value="{PRUNE_DAYS}" maxlength="4" size="4" min="0" max="9999" /> {L_DAYS}</dd>
 		</dl>
 		</fieldset>
diff --git a/phpBB/language/en/acp/forums.php b/phpBB/language/en/acp/forums.php
index b4f0f060e9..541d05c255 100644
--- a/phpBB/language/en/acp/forums.php
+++ b/phpBB/language/en/acp/forums.php
@@ -44,6 +44,10 @@ $lang = array_merge($lang, array(
 	'AUTO_PRUNE_FREQ_EXPLAIN'	=> 'Time in days between pruning events.',
 	'AUTO_PRUNE_VIEWED'			=> 'Auto-prune post viewed age',
 	'AUTO_PRUNE_VIEWED_EXPLAIN'	=> 'Number of days since topic was viewed after which topic is removed.',
+	'AUTO_PRUNE_SHADOW_FREQ'	=> 'Auto-prune shadow topics frequency',
+	'AUTO_PRUNE_SHADOW_DAYS'	=> 'Auto-prune shadow topics age',
+	'AUTO_PRUNE_SHADOW_DAYS_EXPLAIN'	=> 'Number of days after which shadow topic is removed.',
+	'AUTO_PRUNE_SHADOW_FREQ_EXPLAIN'	=> 'Time in days between pruning events.',
 
 	'CONTINUE'						=> 'Continue',
 	'COPY_PERMISSIONS'				=> 'Copy permissions from',