diff --git a/index.html b/index.html
index 7d264d5..e2de0f5 100644
--- a/index.html
+++ b/index.html
@@ -14,7 +14,7 @@
   <link href='https://api.tiles.mapbox.com/mapbox-gl-js/v0.30.0/mapbox-gl.css' rel='stylesheet' />
 </head>
 <body>
-  <iframe id="github-button" src="https://ghbtns.com/github-btn.html?user=lukasmartinelli&repo=osm-liberty&type=star&count=true&size=large" frameborder="0" scrolling="0" width="160px" height="30px"></iframe>
+  <iframe id="github-button" src="https://ghbtns.com/github-btn.html?user=lukasmartinelli&amp;repo=osm-liberty&amp;type=star&amp;count=true&amp;size=large" frameborder="0" scrolling="0" width="160px" height="30px"></iframe>
   <div id='map'></div>
   <script>
   var map = new mapboxgl.Map({
