diff --git a/moonlight/js/moonlight-skulk.js b/moonlight/js/moonlight-skulk.js
index a88e14b..53ed649 100644
--- a/moonlight/js/moonlight-skulk.js
+++ b/moonlight/js/moonlight-skulk.js
@@ -453,9 +453,11 @@ GameState.prototype.update = function()
     this.check_input();
     this.physics.arcade.collide(player, layer);
     
-    this.wanderingSprites.iterate('exists', true, function(x) {
+    function _inner_collidewith(x) {
 	this.physics.arcade.collide(x, layer);
-    });
+    }
+
+    this.wanderingSprites.iterate('exists', true, _inner_collidewith);
     //this.movingLight.x = player.x;
     //this.movingLight.y = player.y;
     this.updateShadowTexture();