diff --git a/roles/mail_forwarder/molecule/default/prepare.yml b/roles/mail_forwarder/molecule/default/prepare.yml
index 55241e8a781ee8705af81f74bdca332cbccff801..eec9c578e7b0d39e181ded29cdedd0754f33fe48 100644
--- a/roles/mail_forwarder/molecule/default/prepare.yml
+++ b/roles/mail_forwarder/molecule/default/prepare.yml
@@ -38,6 +38,11 @@
         10.31.127.31: "parameters-optional-stretch64"
         10.31.127.32: "parameters-no-incoming-stretch64"
 
+    - name: Install tools for testing
+      apt:
+        name: gnutls-bin
+        state: present
+
 - hosts: clients
   become: true
   tasks: