diff --git a/php/containers-schema.json b/php/containers-schema.json
index 1f549027..d82338c8 100644
--- a/php/containers-schema.json
+++ b/php/containers-schema.json
@@ -51,7 +51,7 @@
 					},
 					"container_name": {
 						"type": "string",
-						"pattern": "^nextcloud-aio-[a-z-0-9]+$"
+						"pattern": "^nextcloud-aio-[a-z0-9-]+$"
 					},
 					"internal_port": {
 						"type": "string",