diff --git a/sbin/fsck_ifs/main.c b/sbin/fsck_ifs/main.c
index 2c263da18ab..49ba348f58a 100644
--- a/sbin/fsck_ifs/main.c
+++ b/sbin/fsck_ifs/main.c
@@ -84,7 +84,7 @@ main(argc, argv)
 	sync();
 	skipclean = 1;
 	markclean = 1;
-	while ((ch = getopt(argc, argv, "b:c:dfm:npy")) != -1) {
+	while ((ch = getopt(argc, argv, "b:c:dfFm:npy")) != -1) {
 		switch (ch) {
 		case 'b':
 			skipclean = 0;
@@ -105,6 +105,11 @@ main(argc, argv)
 			skipclean = 0;
 			break;
 
+		case 'F':
+			/* We can never run in background */
+			exit(EEXIT);
+			break;
+
 		case 'm':
 			lfmode = argtoi('m', "mode", optarg, 8);
 			if (lfmode &~ 07777)