diff --git a/router.yml b/router.yml
index 1e13ff0..66f79a3 100644
--- a/router.yml
+++ b/router.yml
@@ -28,8 +28,7 @@
                 entryPoints:
                   - \"https\"
                 tls:
-                  certresolver:
-                    - \"letsencrypt\"
+                  certresolver: letsencrypt
                 middlewares: 
                     - \"secHeaders@file\"
                     - \"auth-router\"