diff --git a/scripts/update_auto_tree b/scripts/update_auto_tree
index 08909e72..a68d561d 100755
--- a/scripts/update_auto_tree
+++ b/scripts/update_auto_tree
@@ -1,2 +1,14 @@
 #!/bin/bash
-PORTDIR="/release/trees/portage-auto/" FEATURES="$FEATURES -news" emerge --sync -q
+PORTDIR="/release/trees/portage-auto/"
+TMPREPO=$(mktemp)
+trap "rm -f $TMPREPO" EXIT
+cat >$f <<EOF
+[DEFAULT]
+main-repo = gentoo
+
+[gentoo]
+location = $PORTDIR
+sync-type = rsync
+sync-uri = rsync://rsync.gentoo.org/gentoo-portage
+EOF
+PORTAGE_REPOSITORIES="$(cat $TMPREPO)" FEATURES="$FEATURES -news" emerge --sync -q
diff --git a/scripts/update_official_tree b/scripts/update_official_tree
index 250e9056..3424cb64 100755
--- a/scripts/update_official_tree
+++ b/scripts/update_official_tree
@@ -1,2 +1,14 @@
 #!/bin/bash
-PORTDIR="/release/trees/portage-official/" emerge --sync
+PORTDIR="/release/trees/portage-official/"
+TMPREPO=$(mktemp)
+trap "rm -f $TMPREPO" EXIT
+cat >$f <<EOF
+[DEFAULT]
+main-repo = gentoo
+
+[gentoo]
+location = $PORTDIR
+sync-type = rsync
+sync-uri = rsync://rsync.gentoo.org/gentoo-portage
+EOF
+PORTAGE_REPOSITORIES="$(cat $TMPREPO)" FEATURES="$FEATURES -news" emerge --sync -q
diff --git a/scripts/update_snapshot_tree b/scripts/update_snapshot_tree
index f64742dc..3a5284ad 100755
--- a/scripts/update_snapshot_tree
+++ b/scripts/update_snapshot_tree
@@ -1,2 +1,14 @@
 #!/bin/bash
-PORTDIR="/release/trees/portage-snapshot/" emerge --sync
+PORTDIR="/release/trees/portage-snapshot/"
+TMPREPO=$(mktemp)
+trap "rm -f $TMPREPO" EXIT
+cat >$f <<EOF
+[DEFAULT]
+main-repo = gentoo
+
+[gentoo]
+location = $PORTDIR
+sync-type = rsync
+sync-uri = rsync://rsync.gentoo.org/gentoo-portage
+EOF
+PORTAGE_REPOSITORIES="$(cat $TMPREPO)" FEATURES="$FEATURES -news" emerge --sync -q