diff --git a/src/branches.cpp b/src/branches.cpp
index 0d2ecce3..f779498c 100644
--- a/src/branches.cpp
+++ b/src/branches.cpp
@@ -456,7 +456,7 @@ Branches::find_and_set_mode_ro()
   Branches::Ptr new_impl;
 
   impl = std::atomic_load(&_impl);
-  new_impl = std::make_shared<Branches::Impl>(impl->minfreespace());
+  new_impl = std::make_shared<Branches::Impl>(&minfreespace);
 
   *new_impl = *impl;