diff --git a/cfengine-ci/cfengine-ci-buildhost.cf b/cfengine-ci/cfengine-ci-buildhost.cf
index b930bc8..9c38fba 100644
--- a/cfengine-ci/cfengine-ci-buildhost.cf
+++ b/cfengine-ci/cfengine-ci-buildhost.cf
@@ -46,6 +46,13 @@ bundle agent cfengine_ci_buildhost
   classes:
     debian_11::
       "have_pip2" expression => fileexists("/usr/local/bin/pip");
+
+  files:
+    debian_9::
+      "/etc/apt/sources.list.d/*"
+        delete => tidy;
+      "/etc/apt/sources.list"
+        content => "deb http://archive.debian.org/debian/ stretch main contrib non-free";
   commands:
     debian_11.!have_pip2::
       "wget https://bootstrap.pypa.io/pip/2.7/get-pip.py -O get-pip.py && python2 get-pip.py && pip install psycopg2-binary"