diff --git a/test/spec/ol/interaction/draganddrop.test.js b/test/spec/ol/interaction/draganddrop.test.js
index 6397e49b56..7e08cea6ef 100644
--- a/test/spec/ol/interaction/draganddrop.test.js
+++ b/test/spec/ol/interaction/draganddrop.test.js
@@ -8,7 +8,7 @@ goog.require('ol.format.GeoJSON');
 goog.require('ol.interaction.DragAndDrop');
 
 
-describe('ol.interaction.DragAndDrop', function() {
+where('FileReader').describe('ol.interaction.DragAndDrop', function() {
   var viewport, map, interaction;
 
   beforeEach(function() {
@@ -83,9 +83,11 @@ describe('ol.interaction.DragAndDrop', function() {
   });
 
   describe('#handleDrop_', function() {
-    var OrigFileReader = FileReader;
+    var OrigFileReader;
 
     beforeEach(function() {
+      OrigFileReader = FileReader;
+
       FileReader = function() {
         ol.events.EventTarget.apply(this, arguments);
         this.readAsText = function(file) {
diff --git a/test/test-extensions.js b/test/test-extensions.js
index deb4c72855..8069893456 100644
--- a/test/test-extensions.js
+++ b/test/test-extensions.js
@@ -464,6 +464,7 @@
   var features = {
     ArrayBuffer: typeof ArrayBuffer === 'function',
     'ArrayBuffer.isView': typeof ArrayBuffer === 'function' && ArrayBuffer.isView,
+    FileReader: 'FileReader' in global,
     Uint8ClampedArray: ('Uint8ClampedArray' in global)
   };