diff --git a/src/branch_tier.cpp b/src/branch_tier.cpp
index 334ba8ae..ceff56a4 100644
--- a/src/branch_tier.cpp
+++ b/src/branch_tier.cpp
@@ -80,6 +80,6 @@ BranchTier::copy_enabled_rw(BranchTier &bt_)
         continue;
       if(b.mode != +Branch2::Mode::RW)
         continue;
-      bt_.emplace_back(b);
+      bt_._branches.emplace_back(b);
     }
 }