diff --git a/qt-everywhere-opensource-src-4.8.2--assistant-crash.patch b/qt-everywhere-opensource-src-4.8.2--assistant-crash.patch
new file mode 100644
index 0000000..f0a41a4
--- /dev/null
+++ b/qt-everywhere-opensource-src-4.8.2--assistant-crash.patch
@@ -0,0 +1,13 @@
+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);
+ }
+ 
diff --git a/qt.spec b/qt.spec
index b09a7f9..07d1c13 100644
--- a/qt.spec
+++ b/qt.spec
@@ -16,7 +16,7 @@ Summary: Qt toolkit
 Name:    qt
 Epoch:   1
 Version: 4.8.2
-Release: 2%{?dist}
+Release: 3%{?dist}
 
 # See LGPL_EXCEPTIONS.txt, LICENSE.GPL3, respectively, for exception details
 License: (LGPLv2 with exceptions or GPLv3 with exceptions) and ASL 2.0 and BSD and FTL and MIT
@@ -111,6 +111,9 @@ Patch77:  qt-everywhere-opensource-src-4.8.1-icu_no_debug.patch
 # gcc doesn't support flag -fuse-ld=gold
 Patch80: qt-everywhere-opensource-src-4.8.0-ld-gold.patch
 
+# https://bugzilla.redhat.com/show_bug.cgi?id=810500
+Patch81: ./qt-everywhere-opensource-src-4.8.2--assistant-crash.patch
+
 # upstream patches
 # http://codereview.qt-project.org/#change,22006
 Patch100: qt-everywhere-opensource-src-4.8.1-qtgahandle.patch
@@ -454,6 +457,7 @@ rm -fv mkspecs/linux-g++*/qmake.conf.multilib-optflags
 %patch76 -p1 -b .s390-atomic
 %patch77 -p1 -b .icu_no_debug
 %patch80 -p1 -b .ld.gold
+%patch81 -p1 -b .assistant-crash
 
 # upstream patches
 %patch100 -p1 -b .QTgaHandler
@@ -1089,6 +1093,9 @@ fi
 
 
 %changelog
+* Tue Jun 19 2012 Than Ngo <than@redhat.com> - 4.8.2-3
+- fix bz#810500, fix crash in assistant
+
 * Tue May 29 2012 Than Ngo <than@redhat.com> - 4.8.2-2
 - fix bz#820767, lrelease-qt4 tries to run qmake not qmake-qt4