diff --git a/node_modules/leaflet.heightgraph/dist/L.Control.Heightgraph.js b/node_modules/leaflet.heightgraph/dist/L.Control.Heightgraph.js
index 122c9ac..1048691 100644
--- a/node_modules/leaflet.heightgraph/dist/L.Control.Heightgraph.js
+++ b/node_modules/leaflet.heightgraph/dist/L.Control.Heightgraph.js
@@ -1,3 +1,4 @@
+(function() {
 'use strict';
 
 function _typeof(obj) {
@@ -5792,3 +5793,4 @@ var schemeSet3 = colors("8dd3c7ffffb3bebadafb807280b1d3fdb462b3de69fccde5d9d9d9b
 
   return L.Control.Heightgraph;
 }, window);
+}());