diff --git a/lib/OpenLayers/Marker.js b/lib/OpenLayers/Marker.js
index f83aecea28..8281f01ff7 100644
--- a/lib/OpenLayers/Marker.js
+++ b/lib/OpenLayers/Marker.js
@@ -17,6 +17,9 @@ OpenLayers.Marker.prototype = {
     /** @type OpenLayers.Map */
     map: null,
     
+    /** @type Object */
+    data: null,
+    
     /** @type DOMElement */
     image: null,