diff --git a/molecule/default/converge.yml b/molecule/default/converge.yml
index 92cbd33..e50f24b 100644
--- a/molecule/default/converge.yml
+++ b/molecule/default/converge.yml
@@ -3,15 +3,17 @@
   hosts: all
   become: true
 
-  vars:
-    munin_packages:
-      - python3-passlib
-      - munin
-
   pre_tasks:
     - name: Update apt cache.
       apt: update_cache=true cache_valid_time=600
       when: ansible_os_family == 'Debian'
 
+    - name: Override munin_packages on Ubuntu.
+      set_fact:
+        munin_packages:
+          - python3-passlib
+          - munin
+      when: ansible_os_family == 'Debian'
+
   roles:
     - role: geerlingguy.munin