diff --git a/collects/net/sendmail-sig.rkt b/collects/net/sendmail-sig.rkt
index d026418..b4d68c2 100644
--- a/collects/net/sendmail-sig.rkt
+++ b/collects/net/sendmail-sig.rkt
@@ -2,4 +2,3 @@
 
 send-mail-message/port
 send-mail-message
-(struct no-mail-recipients ())