diff --git a/phpBB/includes/captcha/plugins/phpbb_recaptcha_plugin.php b/phpBB/includes/captcha/plugins/phpbb_recaptcha_plugin.php
index 2272b10841..9e677f8223 100644
--- a/phpBB/includes/captcha/plugins/phpbb_recaptcha_plugin.php
+++ b/phpBB/includes/captcha/plugins/phpbb_recaptcha_plugin.php
@@ -42,7 +42,7 @@ class phpbb_recaptcha extends phpbb_default_captcha
 	function phpbb_recaptcha()
 	{
 		global $request;
-		$this->recaptcha_server = $request->server('HTTPS') == 'on' ? $this->recaptcha_server_secure : $this->recaptcha_server;
+		$this->recaptcha_server = $request->is_secure() ? $this->recaptcha_server_secure : $this->recaptcha_server;
 	}
 
 	function init($type)
diff --git a/phpBB/includes/functions.php b/phpBB/includes/functions.php
index 9ae1885efd..a4baaa8af1 100644
--- a/phpBB/includes/functions.php
+++ b/phpBB/includes/functions.php
@@ -2069,7 +2069,7 @@ function generate_board_url($without_script_path = false)
 	else
 	{
 		// Do not rely on cookie_secure, users seem to think that it means a secured cookie instead of an encrypted connection
-		$cookie_secure = $request->server('HTTPS') == 'on' ? 1 : 0;
+		$cookie_secure = $request->is_secure() ? 1 : 0;
 		$url = (($cookie_secure) ? 'https://' : 'http://') . $server_name;
 
 		$script_path = $user->page['root_script_path'];
diff --git a/phpBB/install/index.php b/phpBB/install/index.php
index 9928638fc4..3c1ce359ca 100644
--- a/phpBB/install/index.php
+++ b/phpBB/install/index.php
@@ -433,7 +433,7 @@ class module
 		// HTTP_HOST is having the correct browser url in most cases...
 		$server_name = strtolower($request->header('Host', $request->server('SERVER_NAME')));
 		$server_port = $request->server('SERVER_PORT', 0);
-		$secure = ($request->server('HTTPS') == 'on') ? 1 : 0;
+		$secure = $request->is_secure() ? 1 : 0;
 
 		$script_name = $request->server('PHP_SELF');
 		if (!$script_name)
diff --git a/phpBB/install/install_install.php b/phpBB/install/install_install.php
index af3d414071..9be5466ef3 100644
--- a/phpBB/install/install_install.php
+++ b/phpBB/install/install_install.php
@@ -1028,8 +1028,8 @@ class install_install extends module
 		$data['email_enable'] = ($data['email_enable'] !== '') ? $data['email_enable'] : true;
 		$data['server_name'] = ($data['server_name'] !== '') ? $data['server_name'] : $server_name;
 		$data['server_port'] = ($data['server_port'] !== '') ? $data['server_port'] : $request->server('SERVER_PORT', 0);
-		$data['server_protocol'] = ($data['server_protocol'] !== '') ? $data['server_protocol'] : ($request->server('HTTPS') == 'on' ? 'https://' : 'http://');
-		$data['cookie_secure'] = ($data['cookie_secure'] !== '') ? $data['cookie_secure'] : ($request->server('HTTPS') == 'on' ? true : false);
+		$data['server_protocol'] = ($data['server_protocol'] !== '') ? $data['server_protocol'] : ($request->is_secure() ? 'https://' : 'http://');
+		$data['cookie_secure'] = ($data['cookie_secure'] !== '') ? $data['cookie_secure'] : $request->is_secure();
 
 		if ($data['script_path'] === '')
 		{