diff --git a/chroot-script b/chroot-script
index c356bc8..6628d25 100755
--- a/chroot-script
+++ b/chroot-script
@@ -42,7 +42,7 @@ if [ -x /usr/bin/aptitude ] ; then
    fi
 else
    APTINSTALL="apt-get -y --no-install-recommends install $DPKG_OPTIONS"
-   APTUPDATE="apt-get update $DPKG_OPTIONS"
+   APTUPDATE="apt-get --error-on=any update $DPKG_OPTIONS"
    APTUPGRADE="apt-get -y upgrade $DPKG_OPTIONS"
 fi