Run Time Errors with C++ 2011 Threads

I have the following simple program using the thread library of C++11. It compiles but does not run.

#include <iostream>
#include <future>
using namespace std;
double square(int i) {
 return i * i;
}

int main() {
 future<double> fd = async(square, 2);
 double d = fd.get();
 cout << d << endl;
 return 0;
}

Runnning the program gives

terminate called after throwing an instance of 'std::system_error'
  what():  Unknown error -1
Aborted (core dumped)

I use gcc version 4.8.2 (Ubuntu 4.8.2-19ubuntu1) and compile with "g++ -o main3 -std=c++11 -Wall -g main3.cpp -lpthread" Has anybody a good idea what's happening there?