diff --git a/pandoc-1.9.4-no-threaded-runtime.patch b/pandoc-1.9.4-no-threaded-runtime.patch
new file mode 100644
index 0000000..72aa335
--- /dev/null
+++ b/pandoc-1.9.4-no-threaded-runtime.patch
@@ -0,0 +1,42 @@
+Description: Don't build with the threaded runtime. It causes build failures
+  and has a performance penalty.
+Origin: upstream, commit:a5db4246656afae3541936269e727d9a9cc39795
+Forwarded: not-needed
+Bug-Debian: http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=682433
+
+Index: b/pandoc.cabal
+===================================================================
+--- a/pandoc.cabal
++++ b/pandoc.cabal
+@@ -344,12 +344,12 @@
+   else
+     Build-depends: base >= 3 && < 4
+   if impl(ghc >= 7.0.1)
+-    Ghc-Options:   -O2 -rtsopts -threaded -Wall -fno-warn-unused-do-bind -dno-debug-output
++    Ghc-Options:   -O2 -rtsopts -Wall -fno-warn-unused-do-bind -dno-debug-output
+   else
+     if impl(ghc >= 6.12)
+-      Ghc-Options:   -O2 -Wall -threaded -fno-warn-unused-do-bind -dno-debug-output
++      Ghc-Options:   -O2 -Wall -fno-warn-unused-do-bind -dno-debug-output
+     else
+-      Ghc-Options:   -O2 -Wall -threaded
++      Ghc-Options:   -O2 -Wall
+   if impl(ghc >= 7.0.1)
+     Ghc-Prof-Options: -auto-all -caf-all -rtsopts
+   else
+@@ -411,12 +411,12 @@
+   else
+     Build-depends: base >= 3 && < 4
+   if impl(ghc >= 7.0.1)
+-    Ghc-Options:   -O2 -rtsopts -threaded -Wall -fno-warn-unused-do-bind -dno-debug-output
++    Ghc-Options:   -O2 -rtsopts -Wall -fno-warn-unused-do-bind -dno-debug-output
+   else
+     if impl(ghc >= 6.12)
+-      Ghc-Options:   -O2 -Wall -threaded -fno-warn-unused-do-bind -dno-debug-output
++      Ghc-Options:   -O2 -Wall -fno-warn-unused-do-bind -dno-debug-output
+     else
+-      Ghc-Options:   -O2 -Wall -threaded
++      Ghc-Options:   -O2 -Wall
+   if impl(ghc >= 7.0.1)
+     Ghc-Prof-Options: -auto-all -caf-all -rtsopts
+   else
diff --git a/pandoc.spec b/pandoc.spec
index 369851e..5748ccb 100644
--- a/pandoc.spec
+++ b/pandoc.spec
@@ -14,7 +14,7 @@ MediaWiki, groff man pages, EPUB, and S5 and Slidy HTML slide shows.
 
 Name:           %{pkg_name}
 Version:        1.9.4.2
-Release:        5%{?dist}
+Release:        6%{?dist}
 Summary:        Markup conversion tool for markdown
 
 Group:          Applications/Publishing
@@ -48,6 +48,7 @@ BuildRequires:  ghc-zip-archive-devel
 BuildRequires:  ghc-zlib-devel
 # this patch should be removed when texlive gets updated
 Patch1:         pandoc-templates-disable-luatex.patch
+Patch2:         pandoc-1.9.4-no-threaded-runtime.patch
 
 %description
 %{common_description}
@@ -74,6 +75,7 @@ needed by pandoc to generate pdf output.
 %prep
 %setup -q
 %patch1 -p1 -b .orig
+%patch2 -p1 -b .orig
 
 
 %build
@@ -117,6 +119,9 @@ ln -s pandoc %{buildroot}%{_bindir}/hsmarkdown
 
 
 %changelog
+* Fri Oct 26 2012 Jens Petersen <petersen@redhat.com> - 1.9.4.2-6
+- disable threaded rts with upstream patch copied from Debian
+
 * Tue Oct  2 2012 Jens Petersen <petersen@redhat.com> - 1.9.4.2-5
 - add a files section for the pdf subpackage so it is actually created