diff --git a/setup.py b/setup.py
index a93da08..204a98b 100755
--- a/setup.py
+++ b/setup.py
@@ -52,7 +52,7 @@ except:
 
 setuptools.setup(
         name='warcprox',
-        version='2.4b1.dev139',
+        version='2.4b1.dev140',
         description='WARC writing MITM HTTP/S proxy',
         url='https://github.com/internetarchive/warcprox',
         author='Noah Levitt',
diff --git a/warcprox/writerthread.py b/warcprox/writerthread.py
index f823cc6..632ea2c 100644
--- a/warcprox/writerthread.py
+++ b/warcprox/writerthread.py
@@ -89,3 +89,7 @@ class WarcWriterThread(warcprox.BaseStandardPostfetchProcessor):
                 recorded_url.method, recorded_url.url.decode("utf-8"),
                 recorded_url.mimetype, recorded_url.size, payload_digest,
                 type_, filename, offset)
+
+    def _shutdown(self):
+        self.writer_pool.close_writers()
+