diff --git a/src/branches2.hpp b/src/branches2.hpp
index c3aca2ac..b176d875 100644
--- a/src/branches2.hpp
+++ b/src/branches2.hpp
@@ -13,6 +13,9 @@ private:
 
 class Branches2
 {
+public:
+  Branches2(toml::value const &);
+
 public:
   uint64_t min_free_space;