diff --git a/phpBB/includes/ucp/ucp_register.php b/phpBB/includes/ucp/ucp_register.php
index ff51ca7b3c..8660a06dcf 100644
--- a/phpBB/includes/ucp/ucp_register.php
+++ b/phpBB/includes/ucp/ucp_register.php
@@ -64,10 +64,7 @@ class ucp_register
 					$agreed = false;
 				}
 
-				$user->lang_name = $user_lang = $use_lang;
-				$user->lang = array();
-				$user->data['user_lang'] = $user->lang_name;
-				$user->add_lang(array('common', 'ucp'));
+				$user_lang = $use_lang;
 			}
 			else
 			{
@@ -101,7 +98,6 @@ class ucp_register
 
 		if (!$agreed || ($coppa === false && $config['coppa_enable']) || ($coppa && !$config['coppa_enable']))
 		{
-			$add_lang = ($change_lang) ? '&change_lang=' . urlencode($change_lang) : '';
 			$add_coppa = ($coppa !== false) ? '&coppa=' . $coppa : '';
 
 			$s_hidden_fields = array_merge($s_hidden_fields, array(
@@ -147,12 +143,15 @@ class ucp_register
 					'L_COPPA_NO'		=> sprintf($user->lang['UCP_COPPA_BEFORE'], $coppa_birthday),
 					'L_COPPA_YES'		=> sprintf($user->lang['UCP_COPPA_ON_AFTER'], $coppa_birthday),
 
-					'U_COPPA_NO'		=> append_sid("{$phpbb_root_path}ucp.$phpEx", 'mode=register&coppa=0' . $add_lang),
-					'U_COPPA_YES'		=> append_sid("{$phpbb_root_path}ucp.$phpEx", 'mode=register&coppa=1' . $add_lang),
+					'U_COPPA_NO'		=> append_sid("{$phpbb_root_path}ucp.$phpEx", 'mode=register&coppa=0'),
+					'U_COPPA_YES'		=> append_sid("{$phpbb_root_path}ucp.$phpEx", 'mode=register&coppa=1'),
 
 					'S_SHOW_COPPA'		=> true,
 					'S_HIDDEN_FIELDS'	=> build_hidden_fields($s_hidden_fields),
-					'S_UCP_ACTION'		=> append_sid("{$phpbb_root_path}ucp.$phpEx", 'mode=register' . $add_lang),
+					'S_UCP_ACTION'		=> append_sid("{$phpbb_root_path}ucp.$phpEx", 'mode=register'),
+
+					'COOKIE_NAME'		=> $config['cookie_name'],
+					'COOKIE_PATH'		=> $config['cookie_path'],
 				));
 			}
 			else
@@ -164,7 +163,10 @@ class ucp_register
 					'S_SHOW_COPPA'		=> false,
 					'S_REGISTRATION'	=> true,
 					'S_HIDDEN_FIELDS'	=> build_hidden_fields($s_hidden_fields),
-					'S_UCP_ACTION'		=> append_sid("{$phpbb_root_path}ucp.$phpEx", 'mode=register' . $add_lang . $add_coppa),
+					'S_UCP_ACTION'		=> append_sid("{$phpbb_root_path}ucp.$phpEx", 'mode=register' . $add_coppa),
+
+					'COOKIE_NAME'		=> $config['cookie_name'],
+					'COOKIE_PATH'		=> $config['cookie_path'],
 					)
 				);
 			}
@@ -469,6 +471,9 @@ class ucp_register
 			'S_COPPA'			=> $coppa,
 			'S_HIDDEN_FIELDS'	=> $s_hidden_fields,
 			'S_UCP_ACTION'		=> append_sid("{$phpbb_root_path}ucp.$phpEx", 'mode=register'),
+
+			'COOKIE_NAME'		=> $config['cookie_name'],
+			'COOKIE_PATH'		=> $config['cookie_path'],
 		));
 
 		//
diff --git a/phpBB/phpbb/user.php b/phpBB/phpbb/user.php
index 18b7a3d096..2f186593ec 100644
--- a/phpBB/phpbb/user.php
+++ b/phpBB/phpbb/user.php
@@ -69,7 +69,7 @@ class user extends \phpbb\session
 	*/
 	function setup($lang_set = false, $style_id = false)
 	{
-		global $db, $template, $config, $auth, $phpEx, $phpbb_root_path, $cache;
+		global $db, $request, $template, $config, $auth, $phpEx, $phpbb_root_path, $cache;
 		global $phpbb_dispatcher;
 
 		if ($this->data['user_id'] != ANONYMOUS)
@@ -80,7 +80,17 @@ class user extends \phpbb\session
 		}
 		else
 		{
-			$user_lang_name = basename($config['default_lang']);
+			$change_lang = $request->variable($config['cookie_name'] . '_lang', '', true, \phpbb\request\request_interface::COOKIE);
+			if ($change_lang)
+			{
+				$use_lang = basename($change_lang);
+				$user_lang_name = (file_exists($this->lang_path . $use_lang . "/common.$phpEx")) ? $use_lang : basename($config['default_lang']);
+				$this->data['user_lang'] = $user_lang_name;
+			}
+			else
+			{
+				$user_lang_name = basename($config['default_lang']);
+			}
 			$user_date_format = $config['default_dateformat'];
 			$user_timezone = $config['board_timezone'];
 
@@ -190,7 +200,7 @@ class user extends \phpbb\session
 		}
 		unset($lang_set_ext);
 
-		$style_request = request_var('style', 0);
+		$style_request = $request->variable('style', 0);
 		if ($style_request && (!$config['override_user_style'] || $auth->acl_get('a_styles')) && !defined('ADMIN_START'))
 		{
 			global $SID, $_EXTRA_URL;
diff --git a/phpBB/styles/prosilver/template/ucp_agreement.html b/phpBB/styles/prosilver/template/ucp_agreement.html
index b52acdd955..bc4f23cee7 100644
--- a/phpBB/styles/prosilver/template/ucp_agreement.html
+++ b/phpBB/styles/prosilver/template/ucp_agreement.html
@@ -10,6 +10,7 @@
 	*/
 	function change_language(lang_iso)
 	{
+		document.cookie = '{COOKIE_NAME}_lang=' + lang_iso + '; path={COOKIE_PATH}';
 		document.forms['register'].change_lang.value = lang_iso;
 		document.forms['register'].submit();
 	}
diff --git a/phpBB/styles/prosilver/template/ucp_register.html b/phpBB/styles/prosilver/template/ucp_register.html
index fc469eff36..b27003faab 100644
--- a/phpBB/styles/prosilver/template/ucp_register.html
+++ b/phpBB/styles/prosilver/template/ucp_register.html
@@ -7,6 +7,7 @@
 	*/
 	function change_language(lang_iso)
 	{
+		document.cookie = '{COOKIE_NAME}_lang=' + lang_iso + '; path={COOKIE_PATH}';
 		document.forms['register'].change_lang.value = lang_iso;
 		document.forms['register'].submit.click();
 	}
diff --git a/phpBB/styles/subsilver2/template/ucp_agreement.html b/phpBB/styles/subsilver2/template/ucp_agreement.html
index 054d25282f..3afe6e89a0 100644
--- a/phpBB/styles/subsilver2/template/ucp_agreement.html
+++ b/phpBB/styles/subsilver2/template/ucp_agreement.html
@@ -10,6 +10,7 @@
 	*/
 	function change_language(lang_iso)
 	{
+		document.cookie = '{COOKIE_NAME}_lang=' + lang_iso + '; path={COOKIE_PATH}';
 		document.forms['register'].change_lang.value = lang_iso;
 		document.forms['register'].submit();
 	}
diff --git a/phpBB/styles/subsilver2/template/ucp_register.html b/phpBB/styles/subsilver2/template/ucp_register.html
index 3392c557a2..1d55b952e5 100644
--- a/phpBB/styles/subsilver2/template/ucp_register.html
+++ b/phpBB/styles/subsilver2/template/ucp_register.html
@@ -7,6 +7,7 @@
 	*/
 	function change_language(lang_iso)
 	{
+		document.cookie = '{COOKIE_NAME}_lang=' + lang_iso + '; path={COOKIE_PATH}';
 		document.forms['register'].change_lang.value = lang_iso;
 		document.forms['register'].submit.click();
 	}