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-rw-r--r--distbuild/sockserv.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/distbuild/sockserv.py b/distbuild/sockserv.py
index 68991a93..156394e2 100644
--- a/distbuild/sockserv.py
+++ b/distbuild/sockserv.py
@@ -39,7 +39,7 @@ class ListenServer(StateMachine):
if self._port_file:
host, port = src.sock.getsockname()
with open(self._port_file, 'w') as f:
- f.write(port)
+ f.write('%s\n' % port)
self.mainloop.add_event_source(src)
spec = [