diff --git a/stalwart/templates/configmap.yaml b/stalwart/templates/configmap.yaml
index 3f22620..1fa4618 100644
--- a/stalwart/templates/configmap.yaml
+++ b/stalwart/templates/configmap.yaml
@@ -84,7 +84,7 @@ data:
     user = "%{env:STALWART_ADMIN_USER}%"
     secret = "%{env:STALWART_ADMIN_PASSWORD}%"
 
-    [certificate."default"]
+    [certificate.default]
     cert = "file:///opt/stalwart/certs/tls.crt"
     private-key = "file:///opt/stalwart/certs/tls.key"
     default = true