diff --git a/post-build-checks-umount.patch b/post-build-checks-umount.patch
new file mode 100644
index 0000000..8264ebf
--- /dev/null
+++ b/post-build-checks-umount.patch
@@ -0,0 +1,12 @@
+diff -Nur post-build-checks-1.0/checks/99-check-remove-rpms post-build-checks-1.0-new//checks/99-check-remove-rpms
+--- post-build-checks-1.0/checks/99-check-remove-rpms	2008-09-03 15:10:17.000000000 +0200
++++ post-build-checks-1.0-new//checks/99-check-remove-rpms	2010-02-06 18:28:48.718027110 +0100
+@@ -67,4 +67,7 @@
+     }
+ fi
+ 
+-
++# umount proc
++if [ -e $BUILD_ROOT/proc/uptime ]
++	then umount $BUILD_ROOT/proc
++fi
diff --git a/post-build-checks.changes b/post-build-checks.changes
index 1e48d5e..0085739 100644
--- a/post-build-checks.changes
+++ b/post-build-checks.changes
@@ -1,3 +1,8 @@
+-------------------------------------------------------------------
+Sat Feb  6 17:31:27 CET 2010 - detlef@links2linux.de
+
+- add umount patch: Umount $BUILD_ROOT/proc after finished job
+
 -------------------------------------------------------------------
 Mon Dec  7 14:58:27 CET 2009 - mmarek@suse.cz
 
diff --git a/post-build-checks.spec b/post-build-checks.spec
index 0d36322..bee8082 100644
--- a/post-build-checks.spec
+++ b/post-build-checks.spec
@@ -28,6 +28,7 @@ Release:        68
 PreReq:         aaa_base permissions sed
 Source0:        %{name}-%{version}.tar.bz2
 Source1:        suse-buildsystem.sh
+Patch0:         %{name}-umount.patch
 BuildArch:      noarch
 BuildRoot:      %{_tmppath}/%{name}-%{version}-build
 
@@ -44,6 +45,7 @@ it may not be a good idea to install this to a running system:
 
 %prep
 %setup -q
+%patch0 -p1
 
 %build
 # nothing to do