diff --git a/Lib/test/test_dict.py b/Lib/test/test_dict.py
index bbca798..218f7cc 100644
--- a/Lib/test/test_dict.py
+++ b/Lib/test/test_dict.py
@@ -444,6 +444,16 @@
         else:
             self.fail_("g[42] didn't raise KeyError")
 
+    def test_tuple_keyerror(self):
+        # SF #1576657
+        d = {}
+        try:
+            d[(1,)]
+        except KeyError, e:
+            self.assertEqual(e.args, ((1,),))
+        else:
+            self.fail("missing KeyError")
+
 
 from test import mapping_tests