Pyside-uic can't handle action icon theme

Using Qt Designer, I've created a QToolBar with {{QAction}}s. Then I set an Icon theme to the action, i.e. "document-new". If I run pyside-uic on the .ui file, it fails. The official uic for qt4 creates this c++ output for the relevant section:

actionNew = new QAction(MainWindow);
actionNew->setObjectName(QString::fromUtf8("actionNew"));
QIcon icon(QIcon::fromTheme(QString::fromUtf8("document-new")));
actionNew->setIcon(icon);