diff --git a/doc/admin/installation/manual_smallscale.rst b/doc/admin/installation/manual_smallscale.rst
index ac2722160..cecb933bf 100644
--- a/doc/admin/installation/manual_smallscale.rst
+++ b/doc/admin/installation/manual_smallscale.rst
@@ -66,7 +66,7 @@ To build and run pretix, you will need the following debian packages::
 
     # apt-get install git build-essential python3-dev python3-venv python3 python3-pip \
                       libxml2-dev libxslt1-dev libffi-dev zlib1g-dev libssl-dev \
-                      gettext libpq-dev libjpeg-dev libopenjp2-7-dev
+                      gettext libpq-dev libjpeg-dev libopenjp2-7-dev 2to3
 
 Config file
 -----------