qDebug() bug printing long-long-int on windows

It seems that there is no way to print a long long int with qDebug on windows + minGw:

qDebug("val=%lld", _longlongintval);

gives

>warning: unknown conversion type character 'l' in format

while

qDebug("val=%I64d", _longlongintval);

simply print something like: "val=%I64d"

replacing the qDebug() with a printf() works fine with the "%64d" placeholder.