diff --git a/test/objects.js b/test/objects.js
index 2ee0a514d..e2803b21c 100644
--- a/test/objects.js
+++ b/test/objects.js
@@ -3,16 +3,15 @@ $(document).ready(function() {
   module("Objects");
 
   test("objects: keys", function() {
-    var exception = /object/;
     equal(_.keys({one : 1, two : 2}).join(', '), 'one, two', 'can extract the keys from an object');
     // the test above is not safe because it relies on for-in enumeration order
     var a = []; a[1] = 0;
     equal(_.keys(a).join(', '), '1', 'is not fooled by sparse arrays; see issue #95');
-    raises(function() { _.keys(null); }, exception, 'throws an error for `null` values');
-    raises(function() { _.keys(void 0); }, exception, 'throws an error for `undefined` values');
-    raises(function() { _.keys(1); }, exception, 'throws an error for number primitives');
-    raises(function() { _.keys('a'); }, exception, 'throws an error for string primitives');
-    raises(function() { _.keys(true); }, exception, 'throws an error for boolean primitives');
+    raises(function() { _.keys(null); }, TypeError, 'throws an error for `null` values');
+    raises(function() { _.keys(void 0); }, TypeError, 'throws an error for `undefined` values');
+    raises(function() { _.keys(1); }, TypeError, 'throws an error for number primitives');
+    raises(function() { _.keys('a'); }, TypeError, 'throws an error for string primitives');
+    raises(function() { _.keys(true); }, TypeError, 'throws an error for boolean primitives');
   });
 
   test("objects: values", function() {