diff --git a/roles/configure-interfaces/tasks/main.yml b/roles/configure-interfaces/tasks/main.yml
index 5582fc4..175f62c 100644
--- a/roles/configure-interfaces/tasks/main.yml
+++ b/roles/configure-interfaces/tasks/main.yml
@@ -13,6 +13,6 @@
   shell: "(sleep 3s; ifdown {{ interface_name }} && ifup {{ interface_name }};) &"
   ignore_errors: true
   vars:
-    interface_name: {{ ansible_default_ipv4.interface }}
+    interface_name: "{{ ansible_default_ipv4.interface }}"
   async: 100
   poll: 0