diff --git a/qt-x11-opensource-src-4.5.0-fix-qatomic-inline-asm.patch b/qt-x11-opensource-src-4.5.0-fix-qatomic-inline-asm.patch
new file mode 100644
index 0000000..e5ab4ba
--- /dev/null
+++ b/qt-x11-opensource-src-4.5.0-fix-qatomic-inline-asm.patch
@@ -0,0 +1,50 @@
+diff -ur qt-x11-opensource-src-4.5.0/src/corelib/arch/qatomic_i386.h qt-x11-opensource-src-4.5.0-fix-qatomic-inline-asm/src/corelib/arch/qatomic_i386.h
+--- qt-x11-opensource-src-4.5.0/src/corelib/arch/qatomic_i386.h	2009-02-25 22:09:21.000000000 +0100
++++ qt-x11-opensource-src-4.5.0-fix-qatomic-inline-asm/src/corelib/arch/qatomic_i386.h	2009-04-01 17:54:21.000000000 +0200
+@@ -115,8 +115,8 @@
+     asm volatile("lock\n"
+                  "incl %0\n"
+                  "setne %1"
+-                 : "=m" (_q_value), "=qm" (ret)
+-                 : "m" (_q_value)
++                 : "+m" (_q_value), "=qm" (ret)
++                 :
+                  : "memory");
+     return ret != 0;
+ }
+@@ -127,8 +127,8 @@
+     asm volatile("lock\n"
+                  "decl %0\n"
+                  "setne %1"
+-                 : "=m" (_q_value), "=qm" (ret)
+-                 : "m" (_q_value)
++                 : "+m" (_q_value), "=qm" (ret)
++                 :
+                  : "memory");
+     return ret != 0;
+ }
+diff -ur qt-x11-opensource-src-4.5.0/src/corelib/arch/qatomic_x86_64.h qt-x11-opensource-src-4.5.0-fix-qatomic-inline-asm/src/corelib/arch/qatomic_x86_64.h
+--- qt-x11-opensource-src-4.5.0/src/corelib/arch/qatomic_x86_64.h	2009-02-25 22:09:21.000000000 +0100
++++ qt-x11-opensource-src-4.5.0-fix-qatomic-inline-asm/src/corelib/arch/qatomic_x86_64.h	2009-04-01 17:54:32.000000000 +0200
+@@ -116,8 +116,8 @@
+     asm volatile("lock\n"
+                  "incl %0\n"
+                  "setne %1"
+-                 : "=m" (_q_value), "=qm" (ret)
+-                 : "m" (_q_value)
++                 : "+m" (_q_value), "=qm" (ret)
++                 :
+                  : "memory");
+     return ret != 0;
+ }
+@@ -128,8 +128,8 @@
+     asm volatile("lock\n"
+                  "decl %0\n"
+                  "setne %1"
+-                 : "=m" (_q_value), "=qm" (ret)
+-                 : "m" (_q_value)
++                 : "+m" (_q_value), "=qm" (ret)
++                 :
+                  : "memory");
+     return ret != 0;
+ }
diff --git a/qt.spec b/qt.spec
index edd63aa..a55e5e4 100644
--- a/qt.spec
+++ b/qt.spec
@@ -12,7 +12,7 @@ Epoch:   1
 Name:    qt4
 %endif
 Version: 4.5.0
-Release: 11%{?dist}
+Release: 12%{?dist}
 
 # See LGPL_EXCEPTIONS.txt, LICENSE.GPL3, respectively, for exception details
 License: LGPLv2 with exceptions or GPLv3 with exceptions
@@ -50,6 +50,10 @@ Patch14: qt-x11-opensource-src-4.5.0-ia64_boilerplate.patch
 Patch50: qt-x11-opensource-src-4.5.0-rc1-qhostaddress.patch
 Patch51: qt-x11-opensource-src-4.5.0-qdoc3.patch
 Patch52: qt-4.5-sparc64.patch
+# fix invalid inline assembly in qatomic_{i386,x86_64}.h (de)ref implementations
+# should fix the reference counting in qt_toX11Pixmap and thus the Kolourpaint
+# crash with Qt 4.5
+Patch53: qt-x11-opensource-src-4.5.0-fix-qatomic-inline-asm.patch
 
 ## qt-copy patches
 %define qt_copy 20090325
@@ -324,6 +328,7 @@ test -x apply_patches && ./apply_patches
 %patch50 -p1 -b .qhostaddress
 %patch51 -p1 -b .qdoc3
 %patch52 -p1 -b .sparc64
+%patch53 -p1 -b .qatomic-inline-asm
 
 # drop -fexceptions from $RPM_OPT_FLAGS
 RPM_OPT_FLAGS=`echo $RPM_OPT_FLAGS | sed 's|-fexceptions||g'`
@@ -804,6 +809,9 @@ gtk-update-icon-cache -q %{_datadir}/icons/hicolor 2> /dev/null ||:
 
 
 %changelog
+* Wed Apr 01 2009 Kevin Kofler <Kevin@tigcc.ticalc.org> - 4.5.0-12
+- fix inline asm in qatomic (de)ref (i386/x86_64), should fix Kolourpaint crash
+
 * Mon Mar 30 2009 Rex Dieter <rdieter@fedoraproject.org> - 4.5.0-11
 - qt fails to build on ia64 (#492174)