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goodfeaturestotrack corner vector size

Hi, I'm having trouble with goodFeatureToTrack using OpenCV 3.0 in C++ with Qt and MSVC2010.

When I run the following code, the size of corners is 4,289,272,441 (image is ok and displays).

#include <iostream>
#include "opencv.hpp"
#include "world.hpp"
#include <vector>

using namespace cv;
using namespace std;

int main()
{
    Mat frame = imread("lena_color.tif");
    std::vector<cv::Point2f> corners;
    //Mat corners;
    cvtColor(frame,frame,COLOR_RGB2GRAY);

    goodFeaturesToTrack(frame,corners,10,0.001,10);
    cout << corners.size() << endl;

    imshow("Img",frame);
    waitKey();

    return 0;
}

I know corners is not a Mat but when I use it as such I get a size of [1x10], which makes sense.

Has anyone run into this behavior and knows how to explain and fix it?