diff --git a/externs/geojson.js b/externs/geojson.js
index 4d6584539a..db7e1b62e3 100644
--- a/externs/geojson.js
+++ b/externs/geojson.js
@@ -110,6 +110,12 @@ GeoJSONGeometryCollection.prototype.geometries;
 var GeoJSONFeature = function() {};
 
 
+/**
+ * @type {!Array.<number>|undefined}
+ */
+GeoJSONFeature.prototype.bbox;
+
+
 /**
  * @type {GeoJSONGeometry}
  */