diff --git a/src/ol/geom/linestring.js b/src/ol/geom/linestring.js
index 6fde2a37e7..0a76be1014 100644
--- a/src/ol/geom/linestring.js
+++ b/src/ol/geom/linestring.js
@@ -27,6 +27,15 @@ ol.geom.LineString.prototype.getCoordinates = function() {
 };
 
 
+/**
+ * @return {number} Length.
+ */
+ol.geom.LineString.prototype.getLength = function() {
+  return ol.geom.flat.lineStringLength(
+      this.flatCoordinates, 0, this.flatCoordinates.length, this.stride);
+};
+
+
 /**
  * @inheritDoc
  */