diff --git a/Lib/test/test_unittest.py b/Lib/test/test_unittest.py
index 0782119d16e..a9e84506d3b 100644
--- a/Lib/test/test_unittest.py
+++ b/Lib/test/test_unittest.py
@@ -2608,11 +2608,11 @@ test case
 
     def testAssertNotRaisesRegexp(self):
         self.assertRaisesRegexp(
-                self.failureException, '^Exception not raised$',
+                self.failureException, '^Exception not raised by <lambda>$',
                 self.assertRaisesRegexp, Exception, re.compile('x'),
                 lambda: None)
         self.assertRaisesRegexp(
-                self.failureException, '^Exception not raised$',
+                self.failureException, '^Exception not raised by <lambda>$',
                 self.assertRaisesRegexp, Exception, 'x',
                 lambda: None)