Qt Creator looks in wrong directory for executable when using DESTDIR

I have a simple project with the following pro file:

DESTDIR = .
SOURCES += app.cpp

When I open this in Creator using defaults it cannot be run from Creator.

Point is that the program is being built as <shadow-build-dir>\debug\app.exe whereas Creator is looking for <shadow-build-dir>\app.exe

If I append a slash to DESTDIR, it works:

DESTDIR = ./
SOURCES += app.cpp