diff --git a/phpBB/includes/ucp/ucp_register.php b/phpBB/includes/ucp/ucp_register.php
index f428b4603c..babedd4f12 100644
--- a/phpBB/includes/ucp/ucp_register.php
+++ b/phpBB/includes/ucp/ucp_register.php
@@ -223,7 +223,7 @@ class ucp_register
 			if ($config['enable_confirm'])
 			{
 				$vc_response = $captcha->validate($data);
-				if ($vc_response)
+				if ($vc_response !== false)
 				{
 					$error[] = $vc_response;
 				}