diff --git a/templates/docker-daemon.json.j2 b/templates/docker-daemon.json.j2
index ee4be49..c09269f 100644
--- a/templates/docker-daemon.json.j2
+++ b/templates/docker-daemon.json.j2
@@ -2,5 +2,5 @@
 {% if registry_mirror != "" %}
 "registry-mirrors": ["{{ registry_mirror }}"],
 {% endif %}
-  "debug": "{{ debug }}"
+  "debug": {{ debug|lower }}
 }