diff --git a/src/case/button/item.singleselect.radio.js b/src/case/button/item.singleselect.radio.js
index 74ebe49c9..92058b476 100644
--- a/src/case/button/item.singleselect.radio.js
+++ b/src/case/button/item.singleselect.radio.js
@@ -25,6 +25,7 @@ BI.SingleSelectRadioItem = BI.inherit(BI.BasicButton, {
                 type: "bi.center_adapt",
                 items: [{
                     type: "bi.radio",
+                    once: o.once,
                     ref: function (_ref) {
                         self.radio = _ref;
                     },