diff --git a/test/features/theader_binary.py b/test/features/theader_binary.py
index 62a2671..02e010b 100644
--- a/test/features/theader_binary.py
+++ b/test/features/theader_binary.py
@@ -14,57 +14,57 @@
 
 
 def test_void(proto):
-  proto.writeMessageBegin('testVoid', TMessageType.CALL, 3)
-  proto.writeStructBegin('testVoid_args')
-  proto.writeFieldStop()
-  proto.writeStructEnd()
-  proto.writeMessageEnd()
-  proto.trans.flush()
+    proto.writeMessageBegin('testVoid', TMessageType.CALL, 3)
+    proto.writeStructBegin('testVoid_args')
+    proto.writeFieldStop()
+    proto.writeStructEnd()
+    proto.writeMessageEnd()
+    proto.trans.flush()
 
-  _, mtype, _ = proto.readMessageBegin()
-  assert mtype == TMessageType.REPLY
-  proto.readStructBegin()
-  _, ftype, _ = proto.readFieldBegin()
-  assert ftype == TType.STOP
-  proto.readStructEnd()
-  proto.readMessageEnd()
+    _, mtype, _ = proto.readMessageBegin()
+    assert mtype == TMessageType.REPLY
+    proto.readStructBegin()
+    _, ftype, _ = proto.readFieldBegin()
+    assert ftype == TType.STOP
+    proto.readStructEnd()
+    proto.readMessageEnd()
 
 
 # THeader stack should accept binary protocol with optionally framed transport
 def main(argv):
-  p = argparse.ArgumentParser()
-  add_common_args(p)
-  # Since THeaderTransport acts as framed transport when detected frame, we
-  # cannot use --transport=framed as it would result in 2 layered frames.
-  p.add_argument('--override-transport')
-  p.add_argument('--override-protocol')
-  args = p.parse_args()
-  assert args.protocol == 'header'
-  assert args.transport == 'buffered'
-  assert not args.ssl
+    p = argparse.ArgumentParser()
+    add_common_args(p)
+    # Since THeaderTransport acts as framed transport when detected frame, we
+    # cannot use --transport=framed as it would result in 2 layered frames.
+    p.add_argument('--override-transport')
+    p.add_argument('--override-protocol')
+    args = p.parse_args()
+    assert args.protocol == 'header'
+    assert args.transport == 'buffered'
+    assert not args.ssl
 
-  sock = TSocket(args.host, args.port, socket_family=socket.AF_INET)
-  if not args.override_transport or args.override_transport == 'buffered':
-    trans = TBufferedTransport(sock)
-  elif args.override_transport == 'framed':
-    print('TFRAMED')
-    trans = TFramedTransport(sock)
-  else:
-    raise ValueError('invalid transport')
-  trans.open()
+    sock = TSocket(args.host, args.port, socket_family=socket.AF_INET)
+    if not args.override_transport or args.override_transport == 'buffered':
+        trans = TBufferedTransport(sock)
+    elif args.override_transport == 'framed':
+        print('TFRAMED')
+        trans = TFramedTransport(sock)
+    else:
+        raise ValueError('invalid transport')
+    trans.open()
 
-  if not args.override_protocol or args.override_protocol == 'binary':
-    proto = TBinaryProtocol(trans)
-  elif args.override_protocol == 'compact':
-    proto = TCompactProtocol(trans)
-  else:
-    raise ValueError('invalid transport')
+    if not args.override_protocol or args.override_protocol == 'binary':
+        proto = TBinaryProtocol(trans)
+    elif args.override_protocol == 'compact':
+        proto = TCompactProtocol(trans)
+    else:
+        raise ValueError('invalid transport')
 
-  test_void(proto)
-  test_void(proto)
+    test_void(proto)
+    test_void(proto)
 
-  trans.close()
+    trans.close()
 
 
 if __name__ == '__main__':
-  sys.exit(main(sys.argv[1:]))
+    sys.exit(main(sys.argv[1:]))