diff --git a/usr.bin/vacation/vacation.c b/usr.bin/vacation/vacation.c
index 6cfdfc85a606..025a550c87f7 100644
--- a/usr.bin/vacation/vacation.c
+++ b/usr.bin/vacation/vacation.c
@@ -40,7 +40,7 @@ static char copyright[] =
 #ifndef lint
 static char sccsid[] = "From: @(#)vacation.c	8.2 (Berkeley) 1/26/94";
 static char rcsid[] =
-	"$Id: vacation.c,v 1.8 1997/04/23 22:36:51 ache Exp $";
+	"$Id: vacation.c,v 1.9 1997/04/23 22:40:19 ache Exp $";
 #endif /* not lint */
 
 /*
@@ -425,7 +425,7 @@ sendmessage(myname)
 		close(pvect[0]);
 		close(pvect[1]);
 		close(fileno(mfp));
-		execl(_PATH_SENDMAIL, "sendmail", "-f", myname, from, NULL);
+		execl(_PATH_SENDMAIL, "sendmail", "-f", myname, "--", from, NULL);
 		syslog(LOG_ERR, "vacation: can't exec %s: %s",
 			_PATH_SENDMAIL, strerror(errno));
 		_exit(1);