diff --git a/Lib/test/test_struct.py b/Lib/test/test_struct.py
index 6ca35ca..6ac8fdc 100644
--- a/Lib/test/test_struct.py
+++ b/Lib/test/test_struct.py
@@ -560,7 +560,12 @@
                           'spam and eggs')
         self.assertRaises(struct.error, struct.unpack_from, '14s42', store, 0)
 
-
+    def test_Struct_reinitialization(self):
+        # Issue 9422: there was a memory leak when reinitializing a
+        # Struct instance.  This test can be used to detect the leak
+        # when running with regrtest -L.
+        s = struct.Struct('i')
+        s.__init__('ii')
 
 def test_main():
     run_unittest(StructTest)