usrsctp: usrsctp_getsockopt() always returns -1

char buffer[4096];
socklen_t bufferLen;
int ret;

// Check if SCTP_RESET_STREAMS has been negotiated.
ret = usrsctp_getsockopt(this->socket, IPPROTO_SCTP, SCTP_RESET_STREAMS, buffer, &bufferLen);

The remote peer does support SCTP_RESET_STREAMS (it’s Chrome or Firefox, which use usrsctp). However the code above always returns -1. so, unless I’m doing something wrong above, it’s kinda useless.