diff --git a/dom0-updates/patch-dnf-yum-config b/dom0-updates/patch-dnf-yum-config
new file mode 100755
index 0000000..120a5f8
--- /dev/null
+++ b/dom0-updates/patch-dnf-yum-config
@@ -0,0 +1,86 @@
+#!/bin/sh
+#
+# The Qubes OS Project, http://www.qubes-os.org
+#
+# Copyright (C) 2015  Marek Marczykowski-Górecki 
+#                           <marmarek@invisiblethingslab.com>
+#
+# This program is free software; you can redistribute it and/or
+# modify it under the terms of the GNU General Public License
+# as published by the Free Software Foundation; either version 2
+# of the License, or (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software
+# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+#
+#
+
+BEGIN_MARKER="### QUBES BEGIN ###"
+END_MARKER="### QUBES END ###"
+
+set -e
+
+### helper functions begin ###
+
+# set proxy in given config file
+update_conf() {
+    local CONF_PATH="$1"
+    local CONF_OPTIONS="$2"
+
+    # Ensure that Qubes conf markers are present in the file
+    if ! grep -q "$BEGIN_MARKER" $CONF_PATH; then
+        if grep -q "$END_MARKER" $CONF_PATH; then
+            echo "ERROR: found QUBES END marker but not QUBES BEGIN in ${CONF_PATH}" >&2
+            echo "Fix the file by either removing both of them, or adding missing back and retry" >&2
+            exit 1
+        fi
+        cp $CONF_PATH ${CONF_PATH}.qubes-orig
+        echo "$BEGIN_MARKER" >> $CONF_PATH
+        echo "$END_MARKER" >> $CONF_PATH
+    elif ! grep -q "$END_MARKER" $CONF_PATH; then
+        echo "ERROR: found QUBES BEGIN marker but not QUBES END in ${CONF_PATH}" >&2
+        echo "Fix the file by either removing both of them, or adding missing back and retry" >&2
+        exit 1
+    fi
+
+    # Prepare config block
+    local tmpfile=`mktemp`
+    cat > ${tmpfile} <<EOF
+# This part of configuration, until QUBES END, is automatically generated by
+# $0. All changes here will be overriden.
+# If you want to override any option set here, set it again to desired value,
+# below this section
+$CONF_OPTIONS
+EOF
+
+    # And insert it between the markers
+    sed -i -e "/^$BEGIN_MARKER$/,/^$END_MARKER$/{
+        /^$END_MARKER$/b
+        /^$BEGIN_MARKER$/!d
+        r ${tmpfile}
+        }" ${CONF_PATH}
+    rm -f ${tmpfile}
+}
+
+### helper functions end
+
+if [ -e /etc/dnf/dnf.conf ]; then
+    update_conf /etc/dnf/dnf.conf "
+reposdir=/etc/yum.real.repos.d
+installonlypkgs = kernel, kernel-qubes-vm
+distroverpkg = qubes-release"
+fi
+
+if [ -e /etc/yum.conf ]; then
+    update_conf /etc/yum.conf "
+reposdir=/etc/yum.real.repos.d
+installonlypkgs = kernel, kernel-qubes-vm
+distroverpkg = qubes-release"
+fi
+
diff --git a/rpm_spec/core-dom0-linux.spec b/rpm_spec/core-dom0-linux.spec
index b838583..a62fb98 100644
--- a/rpm_spec/core-dom0-linux.spec
+++ b/rpm_spec/core-dom0-linux.spec
@@ -108,6 +108,7 @@ cp -r appmenus-files/* $RPM_BUILD_ROOT/usr/share/qubes-appmenus/
 install -D dom0-updates/qubes-dom0-updates.cron $RPM_BUILD_ROOT/etc/cron.daily/qubes-dom0-updates.cron
 install -D dom0-updates/qubes-dom0-update $RPM_BUILD_ROOT/usr/bin/qubes-dom0-update
 install -D dom0-updates/qubes-receive-updates $RPM_BUILD_ROOT/usr/libexec/qubes/qubes-receive-updates
+install -D dom0-updates/patch-dnf-yum-config $RPM_BUILD_ROOT/usr/lib/qubes/patch-dnf-yum-config
 install -m 0644 -D dom0-updates/qubes-cached.repo $RPM_BUILD_ROOT/etc/yum.real.repos.d/qubes-cached.repo
 install -D dom0-updates/qfile-dom0-unpacker $RPM_BUILD_ROOT/usr/libexec/qubes/qfile-dom0-unpacker
 install -m 0644 -D dom0-updates/qubes.ReceiveUpdates $RPM_BUILD_ROOT/etc/qubes-rpc/qubes.ReceiveUpdates
@@ -183,14 +184,7 @@ xdg-icon-resource forceupdate
 
 xdg-desktop-menu install /usr/share/qubes-appmenus/qubes-dispvm.directory /usr/share/qubes-appmenus/qubes-dispvm-firefox.desktop
 
-sed '/^reposdir\s*=/d' -i /etc/yum.conf
-echo reposdir=/etc/yum.real.repos.d >> /etc/yum.conf
-
-sed '/^installonlypkgs\s*=/d' -i /etc/yum.conf
-echo 'installonlypkgs = kernel, kernel-qubes-vm' >> /etc/yum.conf
-
-sed '/^distroverpkg\s*=/d' -i /etc/yum.conf
-echo 'distroverpkg = qubes-release' >> /etc/yum.conf
+/usr/lib/qubes/patch-dnf-yum-config
 
 systemctl enable qubes-suspend.service >/dev/null 2>&1
 
@@ -245,6 +239,7 @@ chmod -x /etc/grub.d/10_linux
 /etc/cron.daily/qubes-dom0-updates.cron
 /etc/yum.real.repos.d/qubes-cached.repo
 /usr/bin/qubes-dom0-update
+/usr/lib/qubes/patch-dnf-yum-config
 %attr(4750,root,qubes) /usr/libexec/qubes/qfile-dom0-unpacker
 /usr/libexec/qubes/qubes-receive-updates
 /etc/qubes-rpc/qubes.ReceiveUpdates