diff --git a/Lib/test/test_long.py b/Lib/test/test_long.py
index 60adb74a626..3b6081e7d53 100644
--- a/Lib/test/test_long.py
+++ b/Lib/test/test_long.py
@@ -300,6 +300,10 @@ def test_auto_overflow():
                 got = x / y
                 checkit(x, '/', y)
 
+                expected = longx // longy
+                got = x // y
+                checkit(x, '//', y)
+
                 expected = divmod(longx, longy)
                 got = divmod(longx, longy)
                 checkit(x, 'divmod', y)