diff --git a/mod/choice/mod_form.php b/mod/choice/mod_form.php
index 3a70036d738..7e6310328db 100644
--- a/mod/choice/mod_form.php
+++ b/mod/choice/mod_form.php
@@ -50,6 +50,7 @@ class mod_choice_mod_form extends moodleform_mod {
         $repeateloptions['limit']['default'] = 0;
         $repeateloptions['limit']['disabledif'] = array('limitanswers', 'eq', 0);
         $repeateloptions['limit']['rule'] = 'numeric';
+        $repeateloptions['limit']['type'] = PARAM_INT;
 
         $repeateloptions['option']['helpbutton'] = array('choiceoptions', 'choice');
         $mform->setType('option', PARAM_CLEANHTML);