diff --git a/chickpea/static/chickpea/js/leaflet.chickpea.features.js b/chickpea/static/chickpea/js/leaflet.chickpea.features.js
index <HASH>..<HASH> 100644
--- a/chickpea/static/chickpea/js/leaflet.chickpea.features.js
+++ b/chickpea/static/chickpea/js/leaflet.chickpea.features.js
@@ -153,7 +153,7 @@ L.ChickpeaMarker = L.Marker.extend({
     },
 
     changeOverlay: function(layer) {
-        L.Mixin.ChickpeaFeature.prototype.changeOverlay.call(this, layer);
+        L.Mixin.ChickpeaFeature.changeOverlay.call(this, layer);
         // Icon look depends on overlay
         this._redrawIcon();
     },
ChickpeaFeature has no prototype...