diff --git a/src/ol/structs/checksum.js b/src/ol/structs/checksum.js
deleted file mode 100644
index ff72308ad2..0000000000
--- a/src/ol/structs/checksum.js
+++ /dev/null
@@ -1,16 +0,0 @@
-goog.provide('ol.structs.IHasChecksum');
-
-
-
-/**
- * @interface
- */
-ol.structs.IHasChecksum = function() {
-};
-
-
-/**
- * @return {string} The checksum.
- */
-ol.structs.IHasChecksum.prototype.getChecksum = function() {
-};
diff --git a/src/ol/style/circlestyle.js b/src/ol/style/circlestyle.js
index ea4658a0c2..3fc8d8b4ca 100644
--- a/src/ol/style/circlestyle.js
+++ b/src/ol/style/circlestyle.js
@@ -5,7 +5,6 @@ goog.require('ol');
 goog.require('ol.color');
 goog.require('ol.has');
 goog.require('ol.render.canvas');
-goog.require('ol.structs.IHasChecksum');
 goog.require('ol.style.Fill');
 goog.require('ol.style.Image');
 goog.require('ol.style.ImageState');
@@ -20,7 +19,6 @@ goog.require('ol.style.Stroke');
  * @constructor
  * @param {olx.style.CircleOptions=} opt_options Options.
  * @extends {ol.style.Image}
- * @implements {ol.structs.IHasChecksum}
  * @api
  */
 ol.style.Circle = function(opt_options) {
@@ -419,7 +417,7 @@ ol.style.Circle.prototype.drawHitDetectionCanvas_ =
 
 
 /**
- * @inheritDoc
+ * @return {string} The checksum.
  */
 ol.style.Circle.prototype.getChecksum = function() {
   var strokeChecksum = this.stroke_ ?
diff --git a/src/ol/style/fillstyle.js b/src/ol/style/fillstyle.js
index e322df400b..bd80d7a3fd 100644
--- a/src/ol/style/fillstyle.js
+++ b/src/ol/style/fillstyle.js
@@ -1,7 +1,6 @@
 goog.provide('ol.style.Fill');
 
 goog.require('ol.color');
-goog.require('ol.structs.IHasChecksum');
 
 
 
@@ -11,7 +10,6 @@ goog.require('ol.structs.IHasChecksum');
  *
  * @constructor
  * @param {olx.style.FillOptions=} opt_options Options.
- * @implements {ol.structs.IHasChecksum}
  * @api
  */
 ol.style.Fill = function(opt_options) {
@@ -55,7 +53,7 @@ ol.style.Fill.prototype.setColor = function(color) {
 
 
 /**
- * @inheritDoc
+ * @return {string} The checksum.
  */
 ol.style.Fill.prototype.getChecksum = function() {
   if (this.checksum_ === undefined) {
diff --git a/src/ol/style/regularshapestyle.js b/src/ol/style/regularshapestyle.js
index c02786ae3c..8979b046b7 100644
--- a/src/ol/style/regularshapestyle.js
+++ b/src/ol/style/regularshapestyle.js
@@ -5,7 +5,6 @@ goog.require('ol');
 goog.require('ol.color');
 goog.require('ol.has');
 goog.require('ol.render.canvas');
-goog.require('ol.structs.IHasChecksum');
 goog.require('ol.style.AtlasManager');
 goog.require('ol.style.Fill');
 goog.require('ol.style.Image');
@@ -23,7 +22,6 @@ goog.require('ol.style.Stroke');
  * @constructor
  * @param {olx.style.RegularShapeOptions} options Options.
  * @extends {ol.style.Image}
- * @implements {ol.structs.IHasChecksum}
  * @api
  */
 ol.style.RegularShape = function(options) {
@@ -517,7 +515,7 @@ ol.style.RegularShape.prototype.drawHitDetectionCanvas_ =
 
 
 /**
- * @inheritDoc
+ * @return {string} The checksum.
  */
 ol.style.RegularShape.prototype.getChecksum = function() {
   var strokeChecksum = this.stroke_ ?
diff --git a/src/ol/style/strokestyle.js b/src/ol/style/strokestyle.js
index 52a7e29f86..a103c80eb9 100644
--- a/src/ol/style/strokestyle.js
+++ b/src/ol/style/strokestyle.js
@@ -3,7 +3,6 @@ goog.provide('ol.style.Stroke');
 goog.require('goog.crypt');
 goog.require('goog.crypt.Md5');
 goog.require('ol.color');
-goog.require('ol.structs.IHasChecksum');
 
 
 
@@ -16,7 +15,6 @@ goog.require('ol.structs.IHasChecksum');
  *
  * @constructor
  * @param {olx.style.StrokeOptions=} opt_options Options.
- * @implements {ol.structs.IHasChecksum}
  * @api
  */
 ol.style.Stroke = function(opt_options) {
@@ -200,7 +198,7 @@ ol.style.Stroke.prototype.setWidth = function(width) {
 
 
 /**
- * @inheritDoc
+ * @return {string} The checksum.
  */
 ol.style.Stroke.prototype.getChecksum = function() {
   if (this.checksum_ === undefined) {