diff --git a/changelog/upgrade-notes.md b/changelog/upgrade-notes.md
index e1c65292b1..6584dd9c61 100644
--- a/changelog/upgrade-notes.md
+++ b/changelog/upgrade-notes.md
@@ -1,5 +1,11 @@
 ## Upgrade notes
 
+### v3.5.0
+
+* When manually loading an image for `ol.style.Icon`, the image size should now be set
+with the `imgSize` option and not with `size`. `size` is supposed to be used for the
+size of a sub-rectangle in an image sprite.
+
 ### v3.4.0
 
 ### v3.3.0
diff --git a/externs/olx.js b/externs/olx.js
index 1789574ec3..99146c9010 100644
--- a/externs/olx.js
+++ b/externs/olx.js
@@ -6064,6 +6064,7 @@ olx.style.FillOptions.prototype.color;
  *     rotateWithView: (boolean|undefined),
  *     rotation: (number|undefined),
  *     size: (ol.Size|undefined),
+ *     imgSize: (ol.Size|undefined),
  *     src: (string|undefined)}}
  * @api
  */
@@ -6122,7 +6123,7 @@ olx.style.IconOptions.prototype.crossOrigin;
 /**
  * Image object for the icon. If the `src` option is not provided then the
  * provided image must already be loaded. And in that case, it is required
- * to provide the size of the image, with the `size` option.
+ * to provide the size of the image, with the `imgSize` option.
  * @type {Image|undefined}
  * @api
  */
@@ -6196,14 +6197,21 @@ olx.style.IconOptions.prototype.rotation;
 
 /**
  * Icon size in pixel. Can be used together with `offset` to define the
- * sub-rectangle to use from the origin (sprite) icon image. Also, setting
- * the `size` is required if `img` is set and `src` is not.
+ * sub-rectangle to use from the origin (sprite) icon image.
  * @type {ol.Size|undefined}
  * @api
  */
 olx.style.IconOptions.prototype.size;
 
 
+/**
+ * Image size in pixel. Only required if `img` is set and `src` is not.
+ * @type {ol.Size|undefined}
+ * @api
+ */
+olx.style.IconOptions.prototype.imgSize;
+
+
 /**
  * Image source URI.
  * @type {string}
diff --git a/src/ol/style/iconstyle.js b/src/ol/style/iconstyle.js
index 83b9207332..ab1aafd09c 100644
--- a/src/ol/style/iconstyle.js
+++ b/src/ol/style/iconstyle.js
@@ -95,16 +95,30 @@ ol.style.Icon = function(opt_options) {
    */
   var image = goog.isDef(options.img) ? options.img : null;
 
+  /**
+   * @type {ol.Size}
+   */
+  var imgSize = goog.isDef(options.imgSize) ? options.imgSize : null;
+
   /**
    * @type {string|undefined}
    */
   var src = options.src;
 
+  goog.asserts.assert(!(goog.isDef(src) && !goog.isNull(image)),
+      'image and src can not provided at the same time');
+  goog.asserts.assert(
+      !goog.isDef(src) || (goog.isDef(src) && goog.isNull(imgSize)),
+      'imgSize should not be set when src is provided');
+  goog.asserts.assert(
+      goog.isNull(image) || (!goog.isNull(image) && !goog.isNull(imgSize)),
+      'imgSize must be set when image is provided');
+
   if ((!goog.isDef(src) || src.length === 0) && !goog.isNull(image)) {
     src = image.src;
   }
   goog.asserts.assert(goog.isDef(src) && src.length > 0,
-      'must provide a defined and non-empty src');
+      'must provide a defined and non-empty src or image');
 
   /**
    * @type {ol.style.ImageState}
@@ -117,7 +131,7 @@ ol.style.Icon = function(opt_options) {
    * @type {ol.style.IconImage_}
    */
   this.iconImage_ = ol.style.IconImage_.get(
-      image, src, crossOrigin, imageState);
+      image, src, imgSize, crossOrigin, imageState);
 
   /**
    * @private
@@ -351,12 +365,13 @@ ol.style.Icon.prototype.unlistenImageChange = function(listener, thisArg) {
  * @constructor
  * @param {Image} image Image.
  * @param {string|undefined} src Src.
+ * @param {ol.Size} size Size.
  * @param {?string} crossOrigin Cross origin.
  * @param {ol.style.ImageState} imageState Image state.
  * @extends {goog.events.EventTarget}
  * @private
  */
-ol.style.IconImage_ = function(image, src, crossOrigin, imageState) {
+ol.style.IconImage_ = function(image, src, size, crossOrigin, imageState) {
 
   goog.base(this);
 
@@ -392,7 +407,7 @@ ol.style.IconImage_ = function(image, src, crossOrigin, imageState) {
    * @private
    * @type {ol.Size}
    */
-  this.size_ = null;
+  this.size_ = size;
 
   /**
    * @private
@@ -413,15 +428,17 @@ goog.inherits(ol.style.IconImage_, goog.events.EventTarget);
 /**
  * @param {Image} image Image.
  * @param {string} src Src.
+ * @param {ol.Size} size Size.
  * @param {?string} crossOrigin Cross origin.
  * @param {ol.style.ImageState} imageState Image state.
  * @return {ol.style.IconImage_} Icon image.
  */
-ol.style.IconImage_.get = function(image, src, crossOrigin, imageState) {
+ol.style.IconImage_.get = function(image, src, size, crossOrigin, imageState) {
   var iconImageCache = ol.style.IconImageCache.getInstance();
   var iconImage = iconImageCache.get(src, crossOrigin);
   if (goog.isNull(iconImage)) {
-    iconImage = new ol.style.IconImage_(image, src, crossOrigin, imageState);
+    iconImage = new ol.style.IconImage_(
+        image, src, size, crossOrigin, imageState);
     iconImageCache.set(src, crossOrigin, iconImage);
   }
   return iconImage;
diff --git a/test/spec/ol/style/iconstyle.test.js b/test/spec/ol/style/iconstyle.test.js
index e84d55aba1..2fa88d5981 100644
--- a/test/spec/ol/style/iconstyle.test.js
+++ b/test/spec/ol/style/iconstyle.test.js
@@ -109,6 +109,32 @@ describe('ol.style.Icon', function() {
       expect(iconStyle.getOrigin()).to.eql([92, 20]);
     });
   });
+
+  describe('#getImageSize', function() {
+    var imgSize = [144, 192];
+
+    it('takes the real image size', function() {
+      // pretend that the image is already in the cache,
+      // this image will be used for the icon.
+      var cache = ol.style.IconImageCache.getInstance();
+      var src = 'test.png';
+      var iconImage = new ol.style.IconImage_(null, 'test.png', imgSize);
+      cache.set(src, null, iconImage);
+
+      var iconStyle = new ol.style.Icon({
+        src: 'test.png'
+      });
+      expect(iconStyle.getImageSize()).to.eql(imgSize);
+    });
+
+    it('uses the given image size', function() {
+      var iconStyle = new ol.style.Icon({
+        img: {src: 'test.png'},
+        imgSize: imgSize
+      });
+      expect(iconStyle.getImageSize()).to.eql(imgSize);
+    });
+  });
 });
 
 describe('ol.style.IconImageCache', function() {