diff --git a/tests/functional/acp_permissions_test.php b/tests/functional/acp_permissions_test.php
index 36cbbf2359..ddd519506f 100644
--- a/tests/functional/acp_permissions_test.php
+++ b/tests/functional/acp_permissions_test.php
@@ -92,7 +92,7 @@ class phpbb_functional_acp_permissions_test extends phpbb_functional_test_case
 	public function test_change_permission($description, $permission_type, $permission, $mode, $object_name, $object_id)
 	{
 		// Get the form
-		$crawler = self::request('GET', "adm/index.php?i=acp_permissions&icat=16&mode=$mode&${object_name}[0]=$object_id&type=$permission_type&sid=" . $this->sid);
+		$crawler = self::request('GET', "adm/index.php?i=acp_permissions&icat=16&mode=$mode&{$object_name}[0]=$object_id&type=$permission_type&sid=" . $this->sid);
 		$this->assertStringContainsString($this->lang('ACL_SET'), $crawler->filter('h1')->eq(1)->text());
 
 		// XXX globals for \phpbb\auth\auth, refactor it later