diff --git a/src/ol/geom/circle.js b/src/ol/geom/circle.js
index b669dee7d6..7c10fafcfc 100644
--- a/src/ol/geom/circle.js
+++ b/src/ol/geom/circle.js
@@ -72,7 +72,7 @@ ol.geom.Circle.prototype.containsXY = function(x, y) {
   var dx = x - flatCoordinates[0];
   var dy = y - flatCoordinates[1];
   var r = flatCoordinates[this.stride] - flatCoordinates[0];
-  return dx * dx + dy * dy <= r;
+  return Math.sqrt(dx * dx + dy * dy) <= r;
 };