diff --git a/fedorize_image b/fedorize_image
index d08ab17..499a610 100755
--- a/fedorize_image
+++ b/fedorize_image
@@ -52,6 +52,7 @@ mount -t proc proc mnt/proc
 PKGGROUPS=$(cat $PKGLISTFILE)
 export YUM0=$PWD/yum_repo_qubes
 echo "-> Installing package groups..."
+yum clean all -c $PWD/yum.conf $YUM_OPTS -y --installroot=$PWD/mnt
 yum install -c $PWD/yum.conf $YUM_OPTS -y --installroot=$INSTALLDIR $PKGGROUPS || RETCODE=1
 yum update -c $PWD/yum.conf $YUM_OPTS -y --installroot=$INSTALLDIR || RETCODE=1