std::streambuf and boost::asio::basic_streambuf

I am implementing an interface's method that receives a std::streambuf as argument using the boost::asio library and downcasting that std::streambuf to boost::asio::streambuf.

The objetive is implement a TCP/IP communication API abstrating the boost library, so enabling the possibility of changing it in the future, re-implementing the interface.

Below is the code:

class Interface {
  [...]
  virtual size_t readUntil(std::streambuf &streamBuffer,
            const std::string &until) = 0;
  [...]
}

class BoostImplementation : public Interface {
  virtual size_t readUntil(std::streambuf &streamBuffer,
            const std::string &until) {
    [...]
    size_t numBytes = boost::asio::read_until(
      *m_socket,
      dynamic_cast<boost::asio::streambuf&>(streamBuffer),
      until);
    [...]
  }
}

Is the above dynamic_cast<boost::asio::streambuf&>(streamBuffer) an anti-pattern? Is there any other way to do what I want?