localfilename.cpp:43: invalid conversion from 'int*' to 'socklen_t*'

 new_fd = accept(sockfd, (struct sockaddr *)&their_addr, &sin_size);

#include <iostream>
#include <unistd.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <sys/wait.h>
#include <signal.h>
using namespace std;

#define MYPORT 3490
#define BACKLOG 10

int main()
{
	int sockfd, new_fd; //socket file-descriptor
	int sin_size; // will hold the size of a struct sockaddr_in
	struct sockaddr_in my_addr; //!paralel! sockaddr struct
	struct sockaddr_in their_addr; //again
	
	//synopsis AF_INET, SOCK_STREAM(TCP) 0(auto-select fitting protocol)
	sockfd = socket(AF_INET, SOCK_STREAM, 0);
	
	//Localhost settings 
	my_addr.sin_family = AF_INET; //host byte order
	my_addr.sin_port = htons(MYPORT); //network byte order
	my_addr.sin_addr.s_addr = htonl(INADDR_ANY); // network byte order: INADDR_ANY = localhost
	bzero(&(my_addr.sin_zero), 8); //zero the rest of the struct
	
	bind(sockfd, (struct sockaddr *)&my_addr, sizeof(struct sockaddr)); //binding, useful
//only if you have intentions of making a connection to a special port
	
	listen(sockfd, BACKLOG);
	while (true)
	{
		sin_size = sizeof(struct sockaddr_in);
		new_fd = accept(sockfd, (struct sockaddr *)&their_addr, &sin_size);
		char* connect_from = "not implemented yet";
		cout << "server got a connection from: " << connect_from << endl;
		if (!fork()) 
		{
			close(sockfd);
			char *msg = "Wow hello from the other side!"; //msg to send
			int len = strlen(msg); //counts the size of the msg
			send(new_fd, msg, len, 0);
			close(new_fd);
			exit(0);
		}
		close(new_fd);
	}
	return 0;
}