diff --git a/random_captcha_type/random_captcha_type.module b/random_captcha_type/random_captcha_type.module
index 24b7f583de4f74274fe7d86d05828e00e5bb4701..241accf8a884cb0e0946572217ee82a539df424b 100644
--- a/random_captcha_type/random_captcha_type.module
+++ b/random_captcha_type/random_captcha_type.module
@@ -30,7 +30,7 @@ function random_captcha_type_menu() {
 /**
  * Implements hook_captcha().
  */
-function random_captcha_type_captcha($op, $captcha_type = '') {
+function random_captcha_type_captcha($op, $captcha_type = '', $captcha_sid=NULL) {
   switch ($op) {
     case 'list':
       $enabled_types = _random_captcha_type_get_enabled_types();
@@ -53,7 +53,7 @@ function random_captcha_type_captcha($op, $captcha_type = '') {
         }
         list($module, $type) = explode('/', $module_and_type);
         // Call the generate CAPTCHA hook
-        $captcha = module_invoke($module, 'captcha', 'generate', $type);
+        $captcha = module_invoke($module, 'captcha', 'generate', $type, $captcha_sid);
         // Store the current CAPTCHA type so it can be recovered for
         // regenerating the form in the validation phase
         $captcha['form']['random_captcha_type'] = array(