diff --git a/lib/OpenLayers/Format/Filter/v1.js b/lib/OpenLayers/Format/Filter/v1.js
index 74c5e7a381..3bb4214094 100644
--- a/lib/OpenLayers/Format/Filter/v1.js
+++ b/lib/OpenLayers/Format/Filter/v1.js
@@ -425,8 +425,10 @@ OpenLayers.Format.Filter.v1 = OpenLayers.Class(OpenLayers.Format.XML, {
                 });
             },
             "Literal": function(value) {
+                var encode = this.encodeLiteral ||
+                    OpenLayers.Format.Filter.v1.prototype.encodeLiteral;
                 return this.createElementNSPlus("ogc:Literal", {
-                    value: this.encodeLiteral(value)
+                    value: encode(value)
                 });
             },
             "LowerBoundary": function(filter) {