diff --git a/js/source/geojson_source.js b/js/source/geojson_source.js
index ba21609075b..866ab092ae9 100644
--- a/js/source/geojson_source.js
+++ b/js/source/geojson_source.js
@@ -91,7 +91,7 @@ GeoJSONSource.prototype = util.extend(Evented, /** @lends GeoJSONSource.prototyp
         return this;
     },
 
-    _updateData: function(cb) {
+    _updateData: function(callback) {
         this._dirty = false;
         var options = util.extend({
             source: this.id,
@@ -109,7 +109,7 @@ GeoJSONSource.prototype = util.extend(Evented, /** @lends GeoJSONSource.prototyp
         }
         this.workerID = this.dispatcher.send(this.type + '.parse', options, function(err) {
             this._loaded = true;
-            cb(err);
+            callback(err);
 
         }.bind(this));
     },
diff --git a/js/source/video_source.js b/js/source/video_source.js
index 1c5eab8e62b..edf83a3aaf6 100644
--- a/js/source/video_source.js
+++ b/js/source/video_source.js
@@ -166,10 +166,10 @@ VideoSource.prototype = util.inherit(Evented, /** @lends VideoSource.prototype *
         this._currentTime = this.video.currentTime;
     },
 
-    load: function(tile, cb) {
+    load: function(tile, callback) {
         if (this._coord && this._coord.toString() === tile.coord.toString()) {
             this._setTile(tile);
-            cb(null);
+            callback(null);
         }
     },