diff --git a/usr.bin/killall/killall.1 b/usr.bin/killall/killall.1
index df3de49d687..2771bbe76d7 100644
--- a/usr.bin/killall/killall.1
+++ b/usr.bin/killall/killall.1
@@ -38,6 +38,7 @@
 .Op Fl l
 .Op Fl m
 .Op Fl s
+.Op Fl z
 .Op Fl u Ar user
 .Op Fl t Ar tty
 .Op Fl c Ar procname
@@ -103,6 +104,10 @@ or
 flags, limit potentially matching processes to those matching
 the specified
 .Ar progname .
+.It Fl z
+Don't skip zombies.  
+This should not have any effect except to print a few error messages
+if there are zombie processes that match the specified pattern.
 .El
 .Sh ALL PROCESSES
 Sending a signal to all processes with uid
diff --git a/usr.bin/killall/killall.c b/usr.bin/killall/killall.c
index 7be6bc620ae..e06d91e2cea 100644
--- a/usr.bin/killall/killall.c
+++ b/usr.bin/killall/killall.c
@@ -113,6 +113,7 @@ main(int ac, char **av)
 	int		sflag = 0;
 	int		dflag = 0;
 	int		mflag = 0;
+	int		zflag = 0;
 	uid_t		uid = 0;
 	dev_t		tdev = 0;
 	char		thiscmd[MAXCOMLEN + 1];
@@ -177,6 +178,9 @@ main(int ac, char **av)
 			case 'm':
 				mflag++;
 				break;
+			case 'z':
+				zflag++;
+				break;
 			default:
 				if (isalpha(**av)) {
 					if (strncasecmp(*av, "sig", 3) == 0)
@@ -286,6 +290,8 @@ main(int ac, char **av)
 		printf("nprocs %d\n", nprocs);
 
 	for (i = 0; i < nprocs; i++) {
+		if ((procs[i].ki_stat & SZOMB) == SZOMB && !zflag)
+			continue;
 		thispid = procs[i].ki_pid;
 		strncpy(thiscmd, procs[i].ki_comm, MAXCOMLEN);
 		thiscmd[MAXCOMLEN] = '\0';