diff --git a/src/ol/structs/rbush.js b/src/ol/structs/rbush.js
index 349631748f..06367bb75c 100644
--- a/src/ol/structs/rbush.js
+++ b/src/ol/structs/rbush.js
@@ -660,6 +660,7 @@ ol.structs.RBush.prototype.remove_ = function(extent, value) {
       }
     }
   }
+  goog.asserts.fail();
 };