diff --git a/src/ol/coordinate.js b/src/ol/coordinate.js
index 81838416aa..c34247c41f 100644
--- a/src/ol/coordinate.js
+++ b/src/ol/coordinate.js
@@ -182,6 +182,18 @@ ol.coordinate.scale = function(coordinate, s) {
 };
 
 
+/**
+ * @param {ol.Coordinate} coordinate Coordinate.
+ * @param {ol.Coordinate} delta Delta.
+ * @return {ol.Coordinate} Coordinate.
+ */
+ol.coordinate.sub = function(coordinate, delta) {
+  coordinate[0] -= delta[0];
+  coordinate[1] -= delta[1];
+  return coordinate;
+};
+
+
 /**
  * @param {ol.Coordinate} coord1 First coordinate.
  * @param {ol.Coordinate} coord2 Second coordinate.