diff --git a/fs/F2fs.h b/fs/F2fs.h
index f710212..cdad581 100644
--- a/fs/F2fs.h
+++ b/fs/F2fs.h
@@ -29,7 +29,7 @@
 
 status_t Check(const std::string& source);
 status_t Mount(const std::string& source, const std::string& target);
-status_t Format(const std::string& source);
+status_t Format(const std::string& source, const std::string& zoned_device = "");
 
 }  // namespace f2fs
 }  // namespace vold