diff --git a/mbgl-map.js b/mbgl-map.js
index dcee182..286b98b 100644
--- a/mbgl-map.js
+++ b/mbgl-map.js
@@ -120,7 +120,7 @@ document.addEventListener("DOMContentLoaded", function(){
       zoom: 14,
       minZoom: 0,
       hash: true,
-      fadeDuration,: 100 //controls the duration of the fade for text labels and symbols (default 300)
+      fadeDuration: 100, //controls the duration of the fade for text labels and symbols (default 300)
       attributionControl: false
   });