diff --git a/scheme/httpd/surflets/surflet-input-fields.scm b/scheme/httpd/surflets/surflet-input-fields.scm
index 369a276..9b7da21 100644
--- a/scheme/httpd/surflets/surflet-input-fields.scm
+++ b/scheme/httpd/surflets/surflet-input-fields.scm
@@ -401,7 +401,7 @@
 ;;;;;;;;;;;;;;;;;;;;;;;;
 ;;; checkbox input-field
 (define (make-checkbox . maybe-further-attributes)
-  (really-make-checkbox #t
+  (really-make-checkbox 'defined-in-checkbox-transformer
 			checkbox-transformer
 			maybe-further-attributes))