Use absolute imports
diff --git a/Lib/test/test_sets.py b/Lib/test/test_sets.py
index ff834e0..85e4a22 100644
--- a/Lib/test/test_sets.py
+++ b/Lib/test/test_sets.py
@@ -819,7 +819,8 @@
 __test__ = {'libreftest' : libreftest}
 
 def test_main(verbose=None):
-    import test_sets, doctest
+    import doctest
+    from test import test_sets
     test_support.run_unittest(
         TestSetOfSets,
         TestExceptionPropagation,