diff --git a/util-linux/mkfs_ext2.c b/util-linux/mkfs_ext2.c
index fd54734fc..388bd7b88 100644
--- a/util-linux/mkfs_ext2.c
+++ b/util-linux/mkfs_ext2.c
@@ -210,7 +210,7 @@ int mkfs_ext2_main(int argc UNUSED_PARAM, char **argv)
 
 	// using global "option_mask32" instead of local "opts":
 	// we are register starved here
-	opt_complementary = "-1:b+:m+:i+";
+	opt_complementary = "-1:b+:i+:I+:m+";
 	/*opts =*/ getopt32(argv, "cl:b:f:i:I:J:G:N:m:o:g:L:M:O:r:E:T:U:jnqvFS",
 		NULL, &bs, NULL, &bpi, &user_inodesize, NULL, NULL, NULL,
 		&reserved_percent, NULL, NULL, &label, NULL, NULL, NULL, NULL, NULL, NULL);