diff --git a/src/branches.cpp b/src/branches.cpp
index d914b01c..26f1c29c 100644
--- a/src/branches.cpp
+++ b/src/branches.cpp
@@ -472,6 +472,11 @@ Branches::find_and_set_mode_ro()
       branch.mode = Branch::Mode::RO;
       changed = true;
     }
+
+  if(not changed)
+    return;
+
+  std::atomic_store(&_impl,new_impl);
 }
 
 SrcMounts::SrcMounts(Branches &b_)