diff --git a/rpm_spec/core-dom0.spec b/rpm_spec/core-dom0.spec
index 8b0327e8..eba4c817 100644
--- a/rpm_spec/core-dom0.spec
+++ b/rpm_spec/core-dom0.spec
@@ -196,10 +196,10 @@ sed '/^autoballoon=/d;/^lockfile=/d' -i /etc/xen/xl.conf
 echo 'autoballoon=0' >> /etc/xen/xl.conf
 echo 'lockfile="/var/run/qubes/xl-lock"' >> /etc/xen/xl.conf
 
-sed '/^reposdir=/d' -i /etc/yum.conf
+sed '/^reposdir\s*=/d' -i /etc/yum.conf
 echo reposdir=/etc/yum.real.repos.d >> /etc/yum.conf
 
-sed '/^installonlypkgs=/d' -i /etc/yum.conf
+sed '/^installonlypkgs\s*=/d' -i /etc/yum.conf
 echo 'installonlypkgs = kernel, kernel-qubes-vm' >> /etc/yum.conf
 
 chkconfig --add qubes_core || echo "WARNING: Cannot add service qubes_core!"