diff --git a/collects/tests/racket/benchmarks/shootout/typed/sumcol.rktl b/collects/tests/racket/benchmarks/shootout/typed/sumcol.rktl
index d257605eb6..394945a33e 100644
--- a/collects/tests/racket/benchmarks/shootout/typed/sumcol.rktl
+++ b/collects/tests/racket/benchmarks/shootout/typed/sumcol.rktl
@@ -1,4 +1,4 @@
 (for/fold: : Number
            ([acc : Number 0])
-    ([n : String (in-lines)])
+    ([n : (U String EOF) (in-lines)])
   (+ acc (assert (string->number n))))