diff --git a/phpBB/includes/acp/acp_captcha.php b/phpBB/includes/acp/acp_captcha.php
index e03d2a3901..7addee6293 100644
--- a/phpBB/includes/acp/acp_captcha.php
+++ b/phpBB/includes/acp/acp_captcha.php
@@ -194,7 +194,7 @@ class acp_captcha
 		global $phpbb_container;
 
 		$captcha = $phpbb_container->get('captcha.factory')->get_instance($selected);
-		$captcha->init(CONFIRM_REG);
+		$captcha->init(\phpbb\captcha\plugins\confirm_type::REGISTRATION);
 		$captcha->execute_demo();
 
 		garbage_collection();
diff --git a/phpBB/includes/functions.php b/phpBB/includes/functions.php
index 72241b52f0..3bb60af3cc 100644
--- a/phpBB/includes/functions.php
+++ b/phpBB/includes/functions.php
@@ -2408,7 +2408,7 @@ function login_box($redirect = '', $l_explain = '', $l_success = '', $admin = fa
 			case LOGIN_ERROR_ATTEMPTS:
 
 				$captcha = $phpbb_container->get('captcha.factory')->get_instance($config['captcha_plugin']);
-				$captcha->init(CONFIRM_LOGIN);
+				$captcha->init(\phpbb\captcha\plugins\confirm_type::LOGIN);
 				// $captcha->reset();
 
 				$template->assign_vars(array(
diff --git a/phpBB/includes/ucp/ucp_login_link.php b/phpBB/includes/ucp/ucp_login_link.php
index c7c66304b0..b31457aa8c 100644
--- a/phpBB/includes/ucp/ucp_login_link.php
+++ b/phpBB/includes/ucp/ucp_login_link.php
@@ -216,7 +216,7 @@ class ucp_login_link
 				case LOGIN_ERROR_ATTEMPTS:
 
 					$captcha = $phpbb_container->get('captcha.factory')->get_instance($config['captcha_plugin']);
-					$captcha->init(CONFIRM_LOGIN);
+					$captcha->init(\phpbb\captcha\plugins\confirm_type::LOGIN);
 
 					$template->assign_vars(array(
 						'CAPTCHA_TEMPLATE'			=> $captcha->get_template(),