diff --git a/test/collections.js b/test/collections.js
index 69b98c2ac..ff365f8ea 100644
--- a/test/collections.js
+++ b/test/collections.js
@@ -123,12 +123,12 @@ $(document).ready(function() {
   });
 
   test('collections: all', function() {
-    ok(_.all([]), 'the empty set');
-    ok(_.all([true, true, true]), 'all true values');
-    ok(!_.all([true, false, true]), 'one false value');
+    ok(_.all([], _.identity), 'the empty set');
+    ok(_.all([true, true, true], _.identity), 'all true values');
+    ok(!_.all([true, false, true], _.identity), 'one false value');
     ok(_.all([0, 10, 28], function(num){ return num % 2 == 0; }), 'even numbers');
     ok(!_.all([0, 11, 28], function(num){ return num % 2 == 0; }), 'an odd number');
-    ok(_.every([true, true, true]), 'aliased as "every"');
+    ok(_.every([true, true, true], _.identity), 'aliased as "every"');
   });
 
   test('collections: any', function() {
diff --git a/underscore.js b/underscore.js
index 1b5ba3f27..981a7ce8f 100644
--- a/underscore.js
+++ b/underscore.js
@@ -168,7 +168,6 @@
   // Delegates to **ECMAScript 5**'s native `every` if available.
   // Aliased as `all`.
   _.every = _.all = function(obj, iterator, context) {
-    iterator || (iterator = _.identity);
     var result = true;
     if (obj == null) return result;
     if (nativeEvery && obj.every === nativeEvery) return obj.every(iterator, context);