diff --git a/roles/prereq/tasks/main.yml b/roles/prereq/tasks/main.yml
index 97617cf..e857729 100644
--- a/roles/prereq/tasks/main.yml
+++ b/roles/prereq/tasks/main.yml
@@ -17,6 +17,7 @@
     value: "1"
     state: present
     reload: yes
+  when: ansible_all_ipv6_addresses
 
 - name: Add br_netfilter to /etc/modules-load.d/
   copy: