diff --git a/Lib/test/test_set.py b/Lib/test/test_set.py
index dedd1fb..49bdec3 100644
--- a/Lib/test/test_set.py
+++ b/Lib/test/test_set.py
@@ -468,6 +468,16 @@
 class TestSetSubclass(TestSet):
     thetype = SetSubclass
 
+class SetSubclassWithKeywordArgs(set):
+    def __init__(self, iterable=[], newarg=None):
+        set.__init__(self, iterable)
+
+class TestSetSubclassWithKeywordArgs(TestSet):
+    
+    def test_keywords_in_subclass(self):
+        'SF bug #1486663 -- this used to erroneously raise a TypeError'
+        SetSubclassWithKeywordArgs(newarg=1)
+
 class TestFrozenSet(TestJointOps):
     thetype = frozenset
 
@@ -1450,6 +1460,7 @@
     test_classes = (
         TestSet,
         TestSetSubclass,
+        TestSetSubclassWithKeywordArgs,        
         TestFrozenSet,
         TestFrozenSetSubclass,
         TestSetOfSets,