diff --git a/docs/content/guide/unit-testing.ngdoc b/docs/content/guide/unit-testing.ngdoc
index 8f811e3e87cd..90865a77f921 100644
--- a/docs/content/guide/unit-testing.ngdoc
+++ b/docs/content/guide/unit-testing.ngdoc
@@ -260,12 +260,20 @@ myModule.filter('length', function() {
 });
 
 describe('length filter', function() {
+
+  beforeEach(inject(function(_$filter_){  
+    $filter= _$filter_;
+  }));
+
   it('returns 0 when given null', function() {
     var length = $filter('length');
     expect(length(null)).toEqual(0);
   });
 
   it('returns the correct value when given a string of chars', function() {
+  beforeEach(inject(function(_$filter_){  
+    $filter= _$filter_;
+  }));
     var length = $filter('length');
     expect(length('abc')).toEqual(3);
   });