diff --git a/src/ol/webgl/buffer.js b/src/ol/webgl/buffer.js
index 15650b606b..ce7f5d3803 100644
--- a/src/ol/webgl/buffer.js
+++ b/src/ol/webgl/buffer.js
@@ -4,16 +4,6 @@ goog.require('ol');
 goog.require('ol.webgl');
 
 
-/**
- * @enum {number}
- */
-ol.webgl.BufferUsage = {
-  STATIC_DRAW: ol.webgl.STATIC_DRAW,
-  STREAM_DRAW: ol.webgl.STREAM_DRAW,
-  DYNAMIC_DRAW: ol.webgl.DYNAMIC_DRAW
-};
-
-
 /**
  * @constructor
  * @param {Array.<number>=} opt_arr Array.
@@ -33,7 +23,7 @@ ol.webgl.Buffer = function(opt_arr, opt_usage) {
    * @type {number}
    */
   this.usage_ = opt_usage !== undefined ?
-      opt_usage : ol.webgl.BufferUsage.STATIC_DRAW;
+      opt_usage : ol.webgl.Buffer.Usage.STATIC_DRAW;
 
 };
 
@@ -52,3 +42,13 @@ ol.webgl.Buffer.prototype.getArray = function() {
 ol.webgl.Buffer.prototype.getUsage = function() {
   return this.usage_;
 };
+
+
+/**
+ * @enum {number}
+ */
+ol.webgl.Buffer.Usage = {
+  STATIC_DRAW: ol.webgl.STATIC_DRAW,
+  STREAM_DRAW: ol.webgl.STREAM_DRAW,
+  DYNAMIC_DRAW: ol.webgl.DYNAMIC_DRAW
+};