diff --git a/werkzeug/testsuite/test.py b/werkzeug/testsuite/test.py
index 6332e65f3..a23d6b197 100644
--- a/werkzeug/testsuite/test.py
+++ b/werkzeug/testsuite/test.py
@@ -223,6 +223,7 @@ def test_environ_builder_stream_switch(self):
                                     'CONTENT_TYPE': 'multipart/form-data; boundary="%s"' %
                                     boundary})[1]
             assert form == d
+            stream.close()
 
     def test_create_environ(self):
         env = create_environ('/foo?bar=baz', 'http://example.org/')