diff --git a/public/views/backup.html b/public/views/backup.html
index 1bb0d16ce..04664ae2e 100644
--- a/public/views/backup.html
+++ b/public/views/backup.html
@@ -74,7 +74,7 @@
 
     <div class="row" ng-show="show">
         <div class="columns">
-        <div class="p10" style="background:#eee" ng-class="{{index.network == 'testnet': 'enable_text_select'}}">
+        <div class="p10" style="background:#eee" ng-class="{'enable_text_select': index.network == 'testnet'}">
           <span ng-repeat="word in wordsC.mnemonicWords"><span style="white-space:nowrap">{{word}}</span><span ng-show="word.match(/[\u3041-\u308f]/)!=null">&#x3000;</span> </span>  
         </div>
         </div>