diff --git a/Lib/test/test_importlib/test_abc.py b/Lib/test/test_importlib/test_abc.py
index 9e86d600fe1877..b1ab52f966ffdb 100644
--- a/Lib/test/test_importlib/test_abc.py
+++ b/Lib/test/test_importlib/test_abc.py
@@ -43,14 +43,12 @@ def setUp(self):
     def test_subclasses(self):
         # Test that the expected subclasses inherit.
         for subclass in self.subclasses:
-            self.assertIsSubclass(subclass, self.__test,
-                "{0} is not a subclass of {1}".format(subclass, self.__test))
+            self.assertIsSubclass(subclass, self.__test)
 
     def test_superclasses(self):
         # Test that the class inherits from the expected superclasses.
         for superclass in self.superclasses:
-            self.assertIsSubclass(self.__test, superclass,
-               "{0} is not a superclass of {1}".format(superclass, self.__test))
+            self.assertIsSubclass(self.__test, superclass)
 
 
 class MetaPathFinder(InheritanceTests):