How to prevent Django from changing file name when a file with that name already exists?

class OverwriteStorage(FileSystemStorage):

def get_available_name(self, name):
    if self.exists(name):
        os.remove(os.path.join(SOME_PATH, name))
    return name

fs = OverwriteStorage(location=SOME_PATH)

class YourModel(models.Model):
image_file = models.ImageField(storage=fs)