diff --git a/typed-racket-lib/typed-racket/typecheck/error-message.rkt b/typed-racket-lib/typed-racket/typecheck/error-message.rkt
index ee4f6a01..26755f18 100644
--- a/typed-racket-lib/typed-racket/typecheck/error-message.rkt
+++ b/typed-racket-lib/typed-racket/typecheck/error-message.rkt
@@ -18,7 +18,8 @@
                              (-or/c Type/c string?)
                              -any)]
                        [type-mismatch
-                        (-->* ((-or/c Type/c string?) (-or/c Type/c string?))
+                        (-->* ((-or/c Type/c Filter? string?)
+                               (-or/c Type/c Filter? string?))
                               ((-or/c string? #f))
                               -any)])