diff --git a/monitoring.nginx-exporter/templates/docker-compose.yml.j2 b/monitoring.nginx-exporter/templates/docker-compose.yml.j2
index 058b19f..290a439 100644
--- a/monitoring.nginx-exporter/templates/docker-compose.yml.j2
+++ b/monitoring.nginx-exporter/templates/docker-compose.yml.j2
@@ -9,7 +9,7 @@ services:
       - "{{ nginx_exporter__port }}:9113"
 {% if nginx_exporter is defined and nginx_exporter.docker is defined %}
     extra_hosts: {{ nginx_exporter.docker.extra_hosts | default([]) | to_json }}
-    environment: {{ nginx_exporter.docker.environment | default([]) | to_json }}
+    environment: {{ nginx_exporter.docker.environment | default({}) | to_json }}
 {% endif %}
     logging:
       driver: json-file