diff --git a/nginx-proxy-manager/docker-compose.yaml b/nginx-proxy-manager/docker-compose.yaml
index 1c79d51..a9b74da 100644
--- a/nginx-proxy-manager/docker-compose.yaml
+++ b/nginx-proxy-manager/docker-compose.yaml
@@ -14,7 +14,7 @@ services:
       - DB_MYSQL_USER=npm
       - DB_MYSQL_PASSWORD=${DB_MYSQL_PASSWORD}
       - DB_MYSQL_NAME=npm
-    DISABLE_IPV6: 'true'
+      - DISABLE_IPV6=true
     volumes:
       - /mnt/containers/nginx-proxy-manager/container-data/data:/data:Z
       - /mnt/containers/nginx-proxy-manager/container-data/letsencrypt:/etc/letsencrypt:Z