diff --git a/apt/apt_conf.sls b/apt/apt_conf.sls
index 8a07461..5aa3ef1 100644
--- a/apt/apt_conf.sls
+++ b/apt/apt_conf.sls
@@ -32,7 +32,7 @@
     - group: root
     - mode: 644
     - context:
-        data: {{ contents }}
+        data: {{ contents|json }}
     - require_in:
       - file: {{ confd_dir }}
 {% endfor %}