diff --git a/src/ol/geom/polygon.js b/src/ol/geom/polygon.js
index 667a121e43..a068cb6ec4 100644
--- a/src/ol/geom/polygon.js
+++ b/src/ol/geom/polygon.js
@@ -1,5 +1,6 @@
 goog.provide('ol.geom.Polygon');
 
+goog.require('goog.asserts');
 goog.require('ol.extent');
 goog.require('ol.geom.GeometryType');
 goog.require('ol.geom.LinearRing');
@@ -257,6 +258,13 @@ ol.geom.Polygon.prototype.setCoordinates = function(coordinates, opt_layout) {
  */
 ol.geom.Polygon.prototype.setFlatCoordinates =
     function(layout, flatCoordinates, ends) {
+  if (goog.isNull(flatCoordinates)) {
+    goog.asserts.assert(!goog.isNull(ends) && ends.length === 0);
+  } else if (ends.length === 0) {
+    goog.asserts.assert(flatCoordinates.length === 0);
+  } else {
+    goog.asserts.assert(flatCoordinates.length == ends[ends.length - 1]);
+  }
   this.setFlatCoordinatesInternal(layout, flatCoordinates);
   this.ends_ = ends;
   this.dispatchChangeEvent();