diff --git a/main.c b/main.c
index 61d20ca..32f98fa 100644
--- a/main.c
+++ b/main.c
@@ -131,6 +131,7 @@
     root_dev = path_stat.st_dev;
   }
 
+  path[0] = '\0';
   ret = rootdev_wrapper(path, sizeof(path),
                         flag_use_slave,
                         flag_strip_partition,