diff --git a/util-linux/blockdev.c b/util-linux/blockdev.c
index 9b5d86d00..a780d2238 100644
--- a/util-linux/blockdev.c
+++ b/util-linux/blockdev.c
@@ -142,7 +142,7 @@ int blockdev_main(int argc, char **argv)
 	lu = llu;
 	iarg = llu;
 
-	if (!*++argv)
+	if (!*++argv || argv[1])
 		bb_show_usage();
 	fd = xopen(*argv, O_RDONLY);