diff --git a/racket/src/expander/syntax/syntax.rkt b/racket/src/expander/syntax/syntax.rkt
index 0483e2933a..d68166ab1a 100644
--- a/racket/src/expander/syntax/syntax.rkt
+++ b/racket/src/expander/syntax/syntax.rkt
@@ -252,7 +252,7 @@
           (lambda (s)
             (raise-arguments-error 'datum->syntax
                                    "cannot create syntax from cyclic datum"
-                                   s))))
+                                   "datum" s))))
 
 ;; ----------------------------------------
 
diff --git a/racket/src/racket/src/startup.inc b/racket/src/racket/src/startup.inc
index 638933aab2..b2ffc6d619 100644
--- a/racket/src/racket/src/startup.inc
+++ b/racket/src/racket/src/startup.inc
@@ -6078,7 +6078,7 @@ static const char *startup_source =
 "(disallow-cycles)"
 "(hasheq"
 " 'cycle-fail"
-"   (lambda (s_64) (raise-arguments-error 'datum->syntax \"cannot create syntax from cyclic datum\" s_64))))"
+"   (lambda (s_64) (raise-arguments-error 'datum->syntax \"cannot create syntax from cyclic datum\" \"datum\" s_64))))"
 "(define-values"
 "(struct:syntax-state"
 " syntax-state19.1"