diff --git a/README.rst b/README.rst
index 6e6c07d..4270112 100644
--- a/README.rst
+++ b/README.rst
@@ -62,7 +62,7 @@
 To set up a suitable build environment for ``./build.sh``::
 
   $ sudo apt-get install devscripts reprepro debootstrap sbuild
-  $ sudo sbuild-createchroot --include=eatmydata,ccache,gnupg,dh-cargo,cargo,lintian \
+  $ sudo sbuild-createchroot --include=eatmydata,ccache,gnupg,dh-cargo,cargo,lintian,perl-openssl-defaults \
       --chroot-prefix debcargo-unstable unstable \
       /srv/chroot/debcargo-unstable-amd64-sbuild http://deb.debian.org/debian