diff --git a/warcprox/main.py b/warcprox/main.py
index 76e194a..d5a6e3f 100644
--- a/warcprox/main.py
+++ b/warcprox/main.py
@@ -78,6 +78,8 @@ def _build_arg_parser(prog=os.path.basename(sys.argv[0])):
             default='./warcs', help='where to write warcs')
     arg_parser.add_argument('-z', '--gzip', dest='gzip', action='store_true',
             help='write gzip-compressed warc records')
+    arg_parser.add_argument('--no-warc-open-suffix', dest='no_warc_open_suffix',
+            default=False, action='store_true', help=argparse.SUPPRESS)
     arg_parser.add_argument('-n', '--prefix', dest='prefix',
             default='WARCPROX', help='WARC filename prefix')
     arg_parser.add_argument(
diff --git a/warcprox/writer.py b/warcprox/writer.py
index cf8d72d..419fd77 100644
--- a/warcprox/writer.py
+++ b/warcprox/writer.py
@@ -53,6 +53,7 @@ class WarcWriter:
         self._f = None
         self._fpath = None
         self._f_finalname = None
+        self._f_finalname_suffix = '' if options.no_warc_open_suffix else '.open'
         self._serial = 0
         self._lock = threading.RLock()
 
@@ -91,7 +92,7 @@ class WarcWriter:
                         self.prefix, self.timestamp17(), self._serial,
                         self._randomtoken, '.gz' if self.gzip else '')
                 self._fpath = os.path.sep.join([
-                    self.directory, self._f_finalname + '.open'])
+                    self.directory, self._f_finalname + self._f_finalname_suffix])
 
                 self._f = open(self._fpath, 'wb')