diff --git a/minimart/examples/chat-actor.rkt b/minimart/examples/chat-actor.rkt
index c354746..ecf076d 100644
--- a/minimart/examples/chat-actor.rkt
+++ b/minimart/examples/chat-actor.rkt
@@ -1,6 +1,5 @@
 #lang minimart
 
-(require racket/set)
 (require (only-in racket/string string-trim))
 (require "../drivers/tcp.rkt")
 (require "../demand-matcher.rkt")