diff --git a/lib/OpenLayers/Filter/Comparison.js b/lib/OpenLayers/Filter/Comparison.js
index bb40900995..68d8cada8f 100644
--- a/lib/OpenLayers/Filter/Comparison.js
+++ b/lib/OpenLayers/Filter/Comparison.js
@@ -156,7 +156,6 @@ OpenLayers.Filter.Comparison = OpenLayers.Class(OpenLayers.Filter, {
                 result = regexp.test(got);
                 break;
             case OpenLayers.Filter.Comparison.IS_NULL:
-                var got = context[this.property];
                 result = (got === null || got === undefined);
                 break;
         }