diff --git a/lib/OpenLayers/Format/EncodedPolyline.js b/lib/OpenLayers/Format/EncodedPolyline.js
index 1255eb1c91..5e470fa76e 100644
--- a/lib/OpenLayers/Format/EncodedPolyline.js
+++ b/lib/OpenLayers/Format/EncodedPolyline.js
@@ -64,7 +64,7 @@ OpenLayers.Format.EncodedPolyline = OpenLayers.Class(OpenLayers.Format, {
 
         var points = this.decode(encoded, 2);
         var pointGeometries = new Array();
-        for (i in points) {
+        for (var i in points) {
             var point = points[i];
             pointGeometries.push(
                 new OpenLayers.Geometry.Point(point[1] * 1e-5, point[0] * 1e-5)