diff --git a/xpfe/global/resources/content/xulBindings.xml b/xpfe/global/resources/content/xulBindings.xml
index b27bc8e409df..8fd7a2ccaa27 100644
--- a/xpfe/global/resources/content/xulBindings.xml
+++ b/xpfe/global/resources/content/xulBindings.xml
@@ -152,7 +152,11 @@
                                          if (v == 'true') return true; return false;"/>
     </interface>
     <handlers>
-      <handler type="click" value="if (!this.disabled && this.button == 1) this.checked = !this.checked;"/>
+      <handler type="click">
+      <![CDATA[
+        if (!this.disabled && this.button == 1) this.checked = !this.checked; 
+      ]]>
+      </handler>
       <handler type="keypress" key=" " value="if (!this.disabled) this.checked = !this.checked;"/>
     </handlers>
   </binding>