diff --git a/phpBB/phpbb/path_helper.php b/phpBB/phpbb/path_helper.php
index aa898c7b12..6ed8e5be5a 100644
--- a/phpBB/phpbb/path_helper.php
+++ b/phpBB/phpbb/path_helper.php
@@ -220,13 +220,13 @@ class path_helper
 		*
 		* The referer must be specified as a parameter in the query.
 		*/
-		if ($this->request->is_ajax() && $this->symfony_request->get('_referer'))
+		if ($this->request->is_ajax() && $this->request->header('Referer'))
 		{
 			// We need to escape $absolute_board_url because it can be partially concatenated to the result.
 			$absolute_board_url = $this->request->escape($this->symfony_request->getSchemeAndHttpHost() . $this->symfony_request->getBasePath(), true);
 
 			$referer_web_root_path = $this->get_web_root_path_from_ajax_referer(
-				$this->symfony_request->get('_referer'),
+				$this->request->header('Referer'),
 				$absolute_board_url
 			);
 			return $this->web_root_path = $referer_web_root_path;
diff --git a/tests/path_helper/path_helper_test.php b/tests/path_helper/path_helper_test.php
index a2abefb108..86aaa3c734 100644
--- a/tests/path_helper/path_helper_test.php
+++ b/tests/path_helper/path_helper_test.php
@@ -464,9 +464,6 @@ class phpbb_path_helper_test extends phpbb_test_case
 			->setConstructorArgs([new phpbb_mock_request()])
 			->setMethods(['get', 'getSchemeAndHttpHost', 'getBasePath', 'getPathInfo'])
 			->getMock();
-		$symfony_request->method('get')
-			->with('_referer')
-			->willReturn('http://www.phpbb.com/community/route1/route2/');
 		$symfony_request->method('getSchemeAndHttpHost')
 			->willReturn('http://www.phpbb.com');
 		$symfony_request->method('getBasePath')
@@ -480,6 +477,9 @@ class phpbb_path_helper_test extends phpbb_test_case
 			->willReturn(true);
 		$request->method('escape')
 			->willReturnArgument(0);
+		$request->method('header')
+			->with('Referer')
+			->willReturn('http://www.phpbb.com/community/route1/route2/');
 
 		$path_helper = new \phpbb\path_helper(
 			$symfony_request,