diff --git a/racket/src/cs/rumble/error.ss b/racket/src/cs/rumble/error.ss
index 6e700e937b..c2db633ca3 100644
--- a/racket/src/cs/rumble/error.ss
+++ b/racket/src/cs/rumble/error.ss
@@ -150,7 +150,7 @@
         [(null? more) '()]
         [(string? (car more))
          (cond
-          [(null? more)
+          [(null? (cdr more))
            (raise-arguments-error 'raise-arguments-error
                                   "missing value after field string"
                                   "string"