diff --git a/UI/Templates/PreferencesUI/UIxPreferences.wox b/UI/Templates/PreferencesUI/UIxPreferences.wox
index 4d08baaa8..6459c874d 100644
--- a/UI/Templates/PreferencesUI/UIxPreferences.wox
+++ b/UI/Templates/PreferencesUI/UIxPreferences.wox
@@ -653,11 +653,10 @@
                   const:name="forwardKeepCopy"
                   const:id="forwardKeepCopy"
                   var:checked="forwardKeepCopy" />
-                  <var:string label:value="Keep a copy" /></label><br/>
-
-                  <input type="hidden"
-                    const:id="forwardConstraints"
-                    var:value="forwardConstraints" />
+                 <var:string label:value="Keep a copy" /></label><br/>
+                 <script type="text/javascript">
+                   var forwardConstraints = <var:string value="forwardConstraints" const:escapeHTML="NO"/>;
+                  </script>
               </div>
             </div>
           </var:if>
diff --git a/UI/WebServerResources/UIxPreferences.js b/UI/WebServerResources/UIxPreferences.js
index 071ba6da8..8b1f59f9d 100644
--- a/UI/WebServerResources/UIxPreferences.js
+++ b/UI/WebServerResources/UIxPreferences.js
@@ -79,7 +79,7 @@ function savePreferences(sender) {
             }
        
         // We check if we can only to internal/external addresses.
-        var constraints = parseInt($("forwardConstraints").value);
+        var constraints = parseInt(forwardConstraints);
         
         if (constraints > 0) {
             // We first extract the list of 'known domains' to SOGo