diff --git a/warcprox/controller.py b/warcprox/controller.py
index b3f3eaf..42f71de 100644
--- a/warcprox/controller.py
+++ b/warcprox/controller.py
@@ -211,8 +211,6 @@ class WarcproxController(object):
 
             if self.proxy.stats_db:
                 self.proxy.stats_db.stop()
-            if any((t.dedup_db for t in self.warc_writer_threads)):
-                self.warc_writer_threads[0].dedup_db.close()
 
             self.proxy_thread.join()
             if self.playback_proxy is not None:
diff --git a/warcprox/dedup.py b/warcprox/dedup.py
index 78c5434..7a7a025 100644
--- a/warcprox/dedup.py
+++ b/warcprox/dedup.py
@@ -58,9 +58,6 @@ class DedupDb(object):
     def stop(self):
         pass
 
-    def close(self):
-        pass
-
     def sync(self):
         pass
 
@@ -154,9 +151,6 @@ class RethinkDedupDb:
     def stop(self):
         pass
 
-    def close(self):
-        pass
-
     def sync(self):
         pass