diff --git a/lib/OpenLayers/Format/Filter/v1.js b/lib/OpenLayers/Format/Filter/v1.js
index 824984828d..48deb0f9cb 100644
--- a/lib/OpenLayers/Format/Filter/v1.js
+++ b/lib/OpenLayers/Format/Filter/v1.js
@@ -259,9 +259,8 @@ OpenLayers.Format.Filter.v1 = OpenLayers.Class(OpenLayers.Format.XML, {
      * {DOMElement} Updated node element.
      */
     writeOgcExpression: function(value, node) {
-        if(value instanceof OpenLayers.Filter.Function){
-            var child = this.writeNode("Function", value, node);
-            node.appendChild(child);
+        if (value instanceof OpenLayers.Filter.Function){
+            this.writeNode("Function", value, node);
         } else {
             this.writeNode("Literal", value, node);
         }