diff --git a/phpBB/adm/style/acp_main.html b/phpBB/adm/style/acp_main.html
index bad15bef30..6126c16d63 100644
--- a/phpBB/adm/style/acp_main.html
+++ b/phpBB/adm/style/acp_main.html
@@ -21,6 +21,13 @@
 		</div>
 	<!-- ENDIF -->
 
+	<!-- IF S_WRITEABLE_CONFIG -->
+		<div class="errorbox">
+			<h3>{L_WARNING}</h3>
+			<p>{L_WRITEABLE_CONFIG}</p>
+		</div>
+	<!-- ENDIF -->
+
 	<table cellspacing="1">
 		<caption>{L_FORUM_STATS}</caption>
 		<col class="col1" /><col class="col2" /><col class="col1" /><col class="col2" />
diff --git a/phpBB/includes/acp/acp_main.php b/phpBB/includes/acp/acp_main.php
index 4918d99a4a..e5d7fc77c0 100644
--- a/phpBB/includes/acp/acp_main.php
+++ b/phpBB/includes/acp/acp_main.php
@@ -167,7 +167,7 @@ class acp_main
 						$result = $db->sql_query($sql);
 						set_config('upload_dir_size', (int) $db->sql_fetchfield('stat'), true);
 						$db->sql_freeresult($result);
-						
+
 						if (!function_exists('update_last_username'))
 						{
 							include(PHPBB_ROOT_PATH . 'includes/functions_user.' . PHP_EXT);
@@ -198,7 +198,7 @@ class acp_main
 						add_log('admin', 'LOG_RESYNC_POSTCOUNTS');
 
 					break;
-			
+
 					case 'date':
 						if (!$auth->acl_get('a_board'))
 						{
@@ -208,7 +208,7 @@ class acp_main
 						set_config('board_startdate', time() - 1);
 						add_log('admin', 'LOG_RESET_DATE');
 					break;
-				
+
 					case 'db_track':
 						if ($db->truncate)
 						{
@@ -227,7 +227,7 @@ class acp_main
 							FROM ' . FORUMS_TABLE . '
 							WHERE forum_type <> ' . FORUM_CAT;
 						$result = $db->sql_query($sql);
-				
+
 						$forum_ids = array();
 						while ($row = $db->sql_fetchrow($result))
 						{
@@ -277,7 +277,7 @@ class acp_main
 								$db->sql_multi_insert(TOPICS_POSTED_TABLE, $sql_ary);
 							}
 						}
-			
+
 						add_log('admin', 'LOG_RESYNC_POST_MARKING');
 					break;
 
@@ -316,7 +316,7 @@ class acp_main
 		$files_per_day = sprintf('%.2f', $total_files / $boarddays);
 
 		$upload_dir_size = get_formatted_filesize($config['upload_dir_size']);
-	
+
 		$avatar_dir_size = 0;
 
 		if ($avatar_dir = @opendir(PHPBB_ROOT_PATH . $config['avatar_path']))
@@ -459,6 +459,11 @@ class acp_main
 			$template->assign_var('S_REMOVE_INSTALL', true);
 		}
 
+		if (file_exists(PHPBB_ROOT_PATH . 'config.' . PHP_EXT) && is_writeable(PHPBB_ROOT_PATH . 'config.' . PHP_EXT))
+		{
+			$template->assign_var('S_WRITEABLE_CONFIG', true);
+		}
+
 		$this->tpl_name = 'acp_main';
 		$this->page_title = 'ACP_MAIN';
 	}
diff --git a/phpBB/language/en/acp/common.php b/phpBB/language/en/acp/common.php
index 41ade70855..db59100915 100644
--- a/phpBB/language/en/acp/common.php
+++ b/phpBB/language/en/acp/common.php
@@ -269,7 +269,7 @@ $lang = array_merge($lang, array(
 	'SELECT_OPTION'			=> 'Select option',
 
 	'SETTING_TOO_LOW'		=> 'The entered value for the setting “%1$s” is too low. The minimal allowed value is %2$d.',
-	'SETTING_TOO_BIG'		=> 'The entered value for the setting “%1$s” is too big. The maximal allowed value is %2$d.',	
+	'SETTING_TOO_BIG'		=> 'The entered value for the setting “%1$s” is too big. The maximal allowed value is %2$d.',
 	'SETTING_TOO_LONG'		=> 'The entered value for the setting “%1$s” is too long. The maximal allowed length is %2$d.',
 	'SETTING_TOO_SHORT'		=> 'The entered value for the setting “%1$s” is not long enough. The minimal allowed length is %2$d.',
 
@@ -363,6 +363,7 @@ $lang = array_merge($lang, array(
 	'VIEW_INACTIVE_USERS'	=> 'View inactive users',
 
 	'WELCOME_PHPBB'			=> 'Welcome to phpBB',
+	'WRITEABLE_CONFIG'		=> 'Your config file (config.php) is currently world-writeable. We strongly encourage you to change the permissions to 640 or at least to 644 (for example: <a href="http://en.wikipedia.org/wiki/Chmod" rel="external">chmod</a> 640 config.php).',
 ));
 
 // Inactive Users