diff --git a/phpBB/includes/request/request.php b/phpBB/includes/request/request.php
index c0bb453c7c..ae3c526d89 100644
--- a/phpBB/includes/request/request.php
+++ b/phpBB/includes/request/request.php
@@ -79,7 +79,7 @@ class phpbb_request implements phpbb_request_interface
 
 		// simulate request_order = GP
 		$this->original_request = $this->input[phpbb_request_interface::REQUEST];
-		$this->input[phpbb_request_interface::REQUEST] = (array)$this->input[phpbb_request_interface::POST] + (array)$this->input[phpbb_request_interface::GET];
+		$this->input[phpbb_request_interface::REQUEST] = $this->input[phpbb_request_interface::POST] + $this->input[phpbb_request_interface::GET];
 
 		if ($disable_super_globals)
 		{
diff --git a/phpBB/install/install_install.php b/phpBB/install/install_install.php
index 5bf3f572d9..3d7b6f7c88 100644
--- a/phpBB/install/install_install.php
+++ b/phpBB/install/install_install.php
@@ -53,7 +53,7 @@ class install_install extends module
 	function main($mode, $sub)
 	{
 		global $lang, $template, $language, $phpbb_root_path, $phpEx;
-		global $phpbb_container, $cache, $phpbb_log;
+		global $phpbb_container, $cache, $phpbb_log, $request;
 
 		switch ($sub)
 		{
@@ -102,6 +102,9 @@ class install_install extends module
 			break;
 
 			case 'final':
+				// Enable super globals to prevent issues with the new phpbb_request object
+				$request->enable_super_globals();
+
 				// Create a normal container now
 				$phpbb_container = phpbb_create_default_container($phpbb_root_path, $phpEx);