diff --git a/bin/check-example.js b/bin/check-example.js
index 7995118519..ee7b8be5bf 100644
--- a/bin/check-example.js
+++ b/bin/check-example.js
@@ -28,3 +28,6 @@ page.open(examplePath, function(s) {
   }
   phantom.exit(exitCode);
 });
+page.onConsoleMessage = function(msg) {
+  console.log('console:', msg);
+};
diff --git a/src/ol/style/circlestyle.js b/src/ol/style/circlestyle.js
index 8504431bd6..3bc83ed12d 100644
--- a/src/ol/style/circlestyle.js
+++ b/src/ol/style/circlestyle.js
@@ -194,6 +194,9 @@ ol.style.Circle.prototype.render_ = function() {
   canvas.height = size;
   canvas.width = size;
 
+  // canvas.width and height are rounded to the closest integer
+  size = canvas.width;
+
   var context = /** @type {CanvasRenderingContext2D} */
       (canvas.getContext('2d'));
   context.arc(size / 2, size / 2, this.radius_, 0, 2 * Math.PI, true);