diff --git a/src/libtipsy/tipsy2gadget.py b/src/libtipsy/tipsy2gadget.py
index 97cc068..abcfc7d 100755
--- a/src/libtipsy/tipsy2gadget.py
+++ b/src/libtipsy/tipsy2gadget.py
@@ -1,50 +1,50 @@
 #!/usr/bin/env python
 
 from pNbody import *
 from pNbody import libtipsy
 
 import argparse
 
 description=None
 epilog=None
 
 parser = argparse.ArgumentParser(description=description,epilog=epilog)
 
 
 
 parser.add_argument("-o", 
                   "--outputfile",
                   action="store", 
 		  dest="outputfile", 
                   help="name of the output file",
 		  metavar="FILE")
 
 parser.add_argument('files', metavar='FILE', type=str,
                    nargs=1,
                    help='name of the file to convert')
 
 
 #####################################
 # main
 #####################################
 
 opt = parser.parse_args()
 
 file = opt.files[0]
 
 if not os.path.isfile(file):
   print "file %s does not exists."%file
   sys.exit()
 
 pos,vel,mass = libtipsy.read(file)
 
 pos = pos.astype(float32)
 vel = vel.astype(float32)
 mass = mass.astype(float32)
 
 
 if opt.outputfile!=None:
 
-  nb = Nbody(status='new',p_name='snap.dat',pos=pos,vel=vel,mass=mass,ftype='gadget')
+  nb = Nbody(status='new',p_name=opt.outputfile,pos=pos,vel=vel,mass=mass,ftype='gadget')
   nb.set_tpe(2)
   nb.write()