diff --git a/src/ol/render/webgl/webglreplay.js b/src/ol/render/webgl/webglreplay.js
index 0864f811d2..3bfbe613fa 100644
--- a/src/ol/render/webgl/webglreplay.js
+++ b/src/ol/render/webgl/webglreplay.js
@@ -506,7 +506,6 @@ ol.render.webgl.ImageReplay.prototype.setImageStyle = function(imageStyle) {
   goog.asserts.assert(!goog.isNull(anchor));
   var image = imageStyle.getImage(1);
   goog.asserts.assert(!goog.isNull(image));
-  // FIXME getImageSize does not exist for circles
   var imageSize = imageStyle.getImageSize();
   goog.asserts.assert(!goog.isNull(imageSize));
   var opacity = imageStyle.getOpacity();
diff --git a/src/ol/style/circlestyle.js b/src/ol/style/circlestyle.js
index 0d209ba876..6c3490e17e 100644
--- a/src/ol/style/circlestyle.js
+++ b/src/ol/style/circlestyle.js
@@ -137,6 +137,14 @@ ol.style.Circle.prototype.getImageState = function() {
 };
 
 
+/**
+ * @inheritDoc
+ */
+ol.style.Circle.prototype.getImageSize = function() {
+  return this.size_;
+};
+
+
 /**
  * @inheritDoc
  * @api
diff --git a/src/ol/style/imagestyle.js b/src/ol/style/imagestyle.js
index 35c3a3ac16..bf306ab65c 100644
--- a/src/ol/style/imagestyle.js
+++ b/src/ol/style/imagestyle.js
@@ -132,6 +132,12 @@ ol.style.Image.prototype.getImage = goog.abstractMethod;
 ol.style.Image.prototype.getImageState = goog.abstractMethod;
 
 
+/**
+ * @return {ol.Size} Image size.
+ */
+ol.style.Image.prototype.getImageSize = goog.abstractMethod;
+
+
 /**
  * @param {number} pixelRatio Pixel ratio.
  * @return {HTMLCanvasElement|HTMLVideoElement|Image} Image element.
diff --git a/src/ol/style/regularshapestyle.js b/src/ol/style/regularshapestyle.js
index 74850f1225..526724ee2e 100644
--- a/src/ol/style/regularshapestyle.js
+++ b/src/ol/style/regularshapestyle.js
@@ -147,6 +147,14 @@ ol.style.RegularShape.prototype.getImage = function(pixelRatio) {
 };
 
 
+/**
+ * @inheritDoc
+ */
+ol.style.RegularShape.prototype.getImageSize = function() {
+  return this.size_;
+};
+
+
 /**
  * @inheritDoc
  */