The usual.
diff --git a/Lib/dos-8x3/test_fcn.py b/Lib/dos-8x3/test_fcn.py
index 2ae6b99..f2d4537 100644
--- a/Lib/dos-8x3/test_fcn.py
+++ b/Lib/dos-8x3/test_fcn.py
@@ -16,7 +16,7 @@
 if verbose:
     print 'Status from fnctl with O_NONBLOCK: ', rv
     
-if sys.platform in ('netbsd1', 'freebsd2', 'freebsd3'):
+if sys.platform in ('netbsd1', 'freebsd2', 'freebsd3', 'bsdos2', 'bsdos3'):
     lockdata = struct.pack('lxxxxlxxxxlhh', 0, 0, 0, FCNTL.F_WRLCK, 0)
 elif sys.platform in ['aix3', 'aix4']:
     lockdata = struct.pack('hhlllii', FCNTL.F_WRLCK, 0, 0, 0, 0, 0, 0)