diff --git a/mailcow.yml b/mailcow.yml
index 41901d6..daf1761 100644
--- a/mailcow.yml
+++ b/mailcow.yml
@@ -144,8 +144,7 @@
                 entryPoints:
                   - "https"
                 tls:
-                  certresolver:
-                    - "letsencrypt"
+                  certresolver: letsencrypt
                 middlewares: secHeaders@file
             services:
               mailcow: