diff --git a/tasks/main.yml b/tasks/main.yml
index 554c10e..6410992 100644
--- a/tasks/main.yml
+++ b/tasks/main.yml
@@ -1,6 +1,8 @@
 ---
 # tasks file for ansible-role-zerotier
 - import_tasks: install.yml
+  when:
+  - "'zt0' not in ansible_interfaces"
 
 - import_tasks: authorize_node.yml
   when: