diff --git a/src/ol/extent.js b/src/ol/extent.js
index d9d592a03f..3e5c92e2e3 100644
--- a/src/ol/extent.js
+++ b/src/ol/extent.js
@@ -159,8 +159,7 @@ ol.extent.closestSquaredDistanceXY = function(extent, x, y) {
  * @api stable
  */
 ol.extent.containsCoordinate = function(extent, coordinate) {
-  return extent[0] <= coordinate[0] && coordinate[0] <= extent[2] &&
-      extent[1] <= coordinate[1] && coordinate[1] <= extent[3];
+  return ol.extent.containsXY(extent, coordinate[0], coordinate[1]);
 };
 
 
@@ -178,6 +177,20 @@ ol.extent.containsExtent = function(extent1, extent2) {
 };
 
 
+/**
+ * Checks if the passed coordinate is contained or on the edge of the extent.
+ *
+ * @param {ol.Extent} extent Extent.
+ * @param {number} x X coordinate.
+ * @param {number} y Y coordinate.
+ * @return {boolean} Contains.
+ * @api stable
+ */
+ol.extent.containsXY = function(extent, x, y) {
+  return extent[0] <= x && x <= extent[2] && extent[1] <= y && y <= extent[3];
+};
+
+
 /**
  * Get the relationship between a coordinate and extent.
  * @param {ol.Extent} extent The extent.