diff -up qt-everywhere-opensource-src-4.8.2/tools/assistant/tools/assistant/mainwindow.cpp.me qt-everywhere-opensource-src-4.8.2/tools/assistant/tools/assistant/mainwindow.cpp

--- qt-everywhere-opensource-src-4.8.2/tools/assistant/tools/assistant/mainwindow.cpp.me	2012-06-19 12:52:22.740180410 +0200

+++ qt-everywhere-opensource-src-4.8.2/tools/assistant/tools/assistant/mainwindow.cpp	2012-06-19 12:52:51.953194103 +0200

@@ -944,8 +944,7 @@ void MainWindow::updateApplicationFont()

     if (helpEngine.usesAppFont())

         font = helpEngine.appFont();

-    const QWidgetList &widgets = qApp->allWidgets();

-    foreach (QWidget* widget, widgets)

+    foreach (QWidget* widget, QApplication::allWidgets())

         widget->setFont(font);

 }