diff --git a/src/branches.cpp b/src/branches.cpp
index db8ff380..6de83156 100644
--- a/src/branches.cpp
+++ b/src/branches.cpp
@@ -457,7 +457,8 @@ Branches::find_and_set_mode_ro()
 
   *new_impl = *impl;
 
-  for(auto &branch : *impl)
+  bool changed = false;
+  for(auto &branch : *new_impl)
     {
       if(branch.mode != Branch::Mode::RW)
         continue;