diff --git a/phpBB/includes/functions_user.php b/phpBB/includes/functions_user.php
index 93a7c09107..7b11e4f01b 100644
--- a/phpBB/includes/functions_user.php
+++ b/phpBB/includes/functions_user.php
@@ -1330,7 +1330,7 @@ function validate_data($data, $val_ary)
 		{
 			$function = array_shift($validate);
 			array_unshift($validate, $data[$var]);
-			$function_prefix = (function_exists('phpbb_validate_' . $function)) ? 'phpbb_validate_' : 'validate';
+			$function_prefix = (function_exists('phpbb_validate_' . $function)) ? 'phpbb_validate_' : 'validate_';
 
 			if ($result = call_user_func_array($function_prefix . $function, $validate))
 			{