diff --git a/lib/parse/renderer.js b/lib/parse/renderer.js
index f467c23a4..e6854f2ca 100644
--- a/lib/parse/renderer.js
+++ b/lib/parse/renderer.js
@@ -118,8 +118,10 @@ GitBookRenderer.prototype._createCheckboxAndRadios = function(text) {
     if (!match) {
         return text;
     }
-    var quizIdentifier = 'quiz-row-' + this.id + '-' + this.quizRowId + '-' + this.quizIndex++;
-    var field = "<input name='" + quizIdentifier + "' id='" + quizIdentifier + "' type='";
+    //fix radio input uncheck failed
+    var quizFieldName='quiz-row-' + this.id + '-' + this.quizRowId ;
+    var quizIdentifier = quizFieldName + '-' + this.quizIndex++;
+    var field = "<input name='" + quizFieldName + "' id='" + quizIdentifier + "' type='";
     field += match[1] === '(' ? "radio" : "checkbox";
     field += match[2] === 'x' ? "' checked/>" : "'/>";
     var splittedText = text.split(fieldRegex);