Issue in passing argument to std::function for vector of functions

I'm trying to create a vector of std::function and then pass that vector to a function. I also need to pass arguments to the function objects, so I'm using std::bind. Here is the code:

#include <functional>
#include <iostream>
#include <string>
#include <vector>

using namespace std;

void execute(vector<function<void (int)>>& fs) {
    for (auto& f : fs) 
        f();
}

void func(int k) {
    cout << "In func " << k << endl;
}

int main()
{
    int i = 1;
    vector<function<void (int)>> x;
    auto f1 = bind(func, i);
    x.push_back(f1);

    execute(x);
}

but this gives following error:

function_tmpl.cpp: In function ‘void execute(std::vector >&)’:
function_tmpl.cpp:14:5: error: no match for call to ‘(std::function) ()’
   f();
     ^
In file included from function_tmpl.cpp:1:0:
/usr/lib/gcc/x86_64-pc-cygwin/4.9.2/include/c++/functional:2142:11: note: candidate is:
     class function
           ^
/usr/lib/gcc/x86_64-pc-cygwin/4.9.2/include/c++/functional:2434:5: note: _Res std::function::operator()(_ArgTypes ...) const [with _Res = void; _ArgTypes = {int}]
     function::
     ^
/usr/lib/gcc/x86_64-pc-cygwin/4.9.2/include/c++/functional:2434:5: note:   candidate expects 1 argument, 0 provided

If I call f() inside main(), that works fine, which means that the function has bound with the arguments, but it's not working when passed to another function as argument