CLONE - memory leak in QFileDialog

This line

QString fileName = QFileDialog::getOpenFileName(this, "Open File of Graph", currentDir.absolutePath() );

leads to memory leak in 27 bytes

Object Name Size Root Address References To Get#
C++ native memory.8501 27 False 0x04D6D358 0 1

Compiler Visual C++ 2008, profiler AQTime 6.3.

"this" pointer is

MainWindow::MainWindow(QWidget *parent) :
QMainWindow(parent),
ui(new Ui::MainWindow)
{ ...