diff --git a/roles/mail_server/molecule/default/prepare.yml b/roles/mail_server/molecule/default/prepare.yml
index 2eadc76d339b918800e4a647315086a3c8150979..c84fb778856ad4b0ae36f012761da8de1d73571d 100644
--- a/roles/mail_server/molecule/default/prepare.yml
+++ b/roles/mail_server/molecule/default/prepare.yml
@@ -61,7 +61,9 @@
 
     - name: Install tools for testing
       apt:
-        name: gnutls-bin
+        name:
+          - gnutls-bin
+          - nmap
         state: present
 
 - hosts: stretch