diff --git a/roles/configure-interfaces/tasks/main.yml b/roles/configure-interfaces/tasks/main.yml
index 175f62c..41a5c68 100644
--- a/roles/configure-interfaces/tasks/main.yml
+++ b/roles/configure-interfaces/tasks/main.yml
@@ -6,7 +6,7 @@
 
 - name: Copy interface cfg file
   vars:
-    interface_name: {{ ansible_default_ipv4.interface }}
+    interface_name: "{{ ansible_default_ipv4.interface }}"
   template: src=../roles/configure-interfaces/templates/eth.cfg.j2 dest=/etc/network/interfaces.d/{{ interface_name }}.cfg
 
 - name: Up down interface