diff --git a/internal/helper/validation/valid_notification_variables.go b/internal/helper/validation/valid_notification_variables.go
index 261406f6..6ef69187 100644
--- a/internal/helper/validation/valid_notification_variables.go
+++ b/internal/helper/validation/valid_notification_variables.go
@@ -11,9 +11,7 @@ import (
 
 var _ validator.Set = notificationVariablesValidator{}
 
-type notificationVariablesValidator struct {
-	schemes []string
-}
+type notificationVariablesValidator struct{}
 
 func (v notificationVariablesValidator) Description(_ context.Context) string {
 	return "value must be a valid set of webhook variables"