diff --git a/Lib/unittest.py b/Lib/unittest.py
index ea9f5f6..9f5cea5e 100644
--- a/Lib/unittest.py
+++ b/Lib/unittest.py
@@ -881,8 +881,8 @@
             self.fail(self._formatMessage(msg, standardMsg))
 
     def assertDictEqual(self, d1, d2, msg=None):
-        self.assert_(isinstance(d1, dict), 'First argument is not a dictionary')
-        self.assert_(isinstance(d2, dict), 'Second argument is not a dictionary')
+        self.assertTrue(isinstance(d1, dict), 'First argument is not a dictionary')
+        self.assertTrue(isinstance(d2, dict), 'Second argument is not a dictionary')
 
         if d1 != d2:
             standardMsg = ('\n' + '\n'.join(difflib.ndiff(
@@ -949,9 +949,9 @@
 
     def assertMultiLineEqual(self, first, second, msg=None):
         """Assert that two multi-line strings are equal."""
-        self.assert_(isinstance(first, str), (
+        self.assertTrue(isinstance(first, str), (
                 'First argument is not a string'))
-        self.assert_(isinstance(second, str), (
+        self.assertTrue(isinstance(second, str), (
                 'Second argument is not a string'))
 
         if first != second: