diff --git a/typed-racket-test/main.rkt b/typed-racket-test/main.rkt
index 4a988c60e..bd06c379b 100644
--- a/typed-racket-test/main.rkt
+++ b/typed-racket-test/main.rkt
@@ -265,7 +265,7 @@
    #:multi
    ["--excl" test "exclude tests" (excl (set-add (excl) test))])
 
-  (start-workers)
+  (void (start-workers))
 
   (define unit-test-retcode (if (unit?)
                                 (run-unit-test-suite (or (places) 1))