diff --git a/user/fs/mkf.c b/user/fs/mkf.c
index 3da1f59..28780ce 100644
--- a/user/fs/mkf.c
+++ b/user/fs/mkf.c
@@ -22,7 +22,7 @@ void fs_mkf(void) {
   char *path = *(args()+1);
 
   int32_t ret;
-  if ((ret = parse_args(args()+2, argslen()-1, ARGS)) < 0) {
+  if ((ret = parse_args(args()+2, argslen()-2, ARGS)) < 0) {
     uprintf("fs mkf: Could not parse args: %d\n", ret);
   }