diff --git a/config/sample-config.yaml b/config/sample-config.yaml
index 24f775adf..b03ffb6a8 100644
--- a/config/sample-config.yaml
+++ b/config/sample-config.yaml
@@ -1522,7 +1522,6 @@ frontend:
       component: autocomplete
       placeholder: 'E.g: NoError, NXDomain, NotAuth'
       hint: Add DNS RCODE name filter.
-      placeholder: 'E.g: NoError, NXDomain, NotAuth'
       examples: |-
         Specify a single DNS RCODE name like:
                 - A IANA RCODE number like 0, 3, 9