diff --git a/src/killall5.c b/src/killall5.c
index 27b5778..25b333e 100644
--- a/src/killall5.c
+++ b/src/killall5.c
@@ -1006,7 +1006,7 @@ int main_pidof(int argc, char **argv)
 	if ((token = getenv("PIDOF_NETFS")) && (strcmp(token,"no") != 0))
 		flags |= PIDOF_NETFS;
 
-	while ((opt = getopt(argc,argv,"qhcof:sxn")) != EOF) switch (opt) {
+	while ((opt = getopt(argc,argv,"qhco:f:sxn")) != EOF) switch (opt) {
 		case '?':
 			nsyslog(LOG_ERR,"invalid options on command line!\n");
 			closelog();