diff --git a/CHANGELOG b/CHANGELOG
index a3d6487..87afc76 100644
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -1,3 +1,5 @@
+* Use `Prototype.emptyFunction` consistently throughout unit tests. [#253 state:resolved] (Michael M Slusarz, John David Dalton, kangax)
+
 * deprecation extension: mark Array#reduce() as removed. [#569 state:resolved] (Tobie Langel)
 
 * `Form.serialize` now works safely with forms that have "length"-named elements. [#77 state:resolved] (Peter Adrianov, John-David Dalton, kangax)
diff --git a/test/unit/ajax_test.js b/test/unit/ajax_test.js
index bd59062..7848a83 100644
--- a/test/unit/ajax_test.js
+++ b/test/unit/ajax_test.js
@@ -96,7 +96,7 @@ new Test.Unit.Runner({
       onComplete: Prototype.emptyFunction
     }
     var request = new Ajax.Updater("content", "../fixtures/hello.js", options);
-    request.options.onComplete = function() {};
+    request.options.onComplete = Prototype.emptyFunction;
     this.assertIdentical(Prototype.emptyFunction, options.onComplete);
   },
   
@@ -105,7 +105,7 @@ new Test.Unit.Runner({
     this.assertEqual(1, Ajax.Responders.responders.length);
     
     var dummyResponder = {
-      onComplete: function(req) { /* dummy */ }
+      onComplete: Prototype.emptyFunction
     };
     
     Ajax.Responders.register(dummyResponder);
@@ -376,4 +376,4 @@ new Test.Unit.Runner({
       this.info(message);
     }
   }
-});
\ No newline at end of file
+});
diff --git a/test/unit/event_test.js b/test/unit/event_test.js
index 49abde3..c399b88 100644
--- a/test/unit/event_test.js
+++ b/test/unit/event_test.js
@@ -138,7 +138,7 @@ new Test.Unit.Runner({
   },
   
   testStopObservingRemovesHandlerFromCache: function() {
-    var span = $("span"), observer = function() { }, eventID;
+    var span = $("span"), observer = Prototype.emptyFunction, eventID;
     
     span.observe("test:somethingHappened", observer);
     
@@ -158,7 +158,7 @@ new Test.Unit.Runner({
   },
   
   testObserveAndStopObservingAreChainable: function() {
-    var span = $("span"), observer = function() { };
+    var span = $("span"), observer = Prototype.emptyFunction;
 
     this.assertEqual(span, span.observe("test:somethingHappened", observer));
     this.assertEqual(span, span.stopObserving("test:somethingHappened", observer));
@@ -192,7 +192,7 @@ new Test.Unit.Runner({
   testEventStopped: function() {
     var span = $("span"), event;
 
-    span.observe("test:somethingHappened", function() { });
+    span.observe("test:somethingHappened", Prototype.emptyFunction);
     event = span.fire("test:somethingHappened");
     this.assert(!event.stopped, "event.stopped should be false with an empty observer");
     span.stopObserving("test:somethingHappened");